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class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.05151">arXiv:2412.05151</a> <span> [<a href="https://arxiv.org/pdf/2412.05151">pdf</a>, <a href="https://arxiv.org/format/2412.05151">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Analysis of long-lived effects in high-repetition-rate stroboscopic transient X-ray absorption experiments on thin films </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Lojewski%2C+T">Tobias Lojewski</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/?searchtype=author&query=Deiter%2C+C">Carsten Deiter</a>, <a href="/search/?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=de+Groot%2C+F">Frank de Groot</a>, <a href="/search/?searchtype=author&query=Hansen%2C+K">Karsten Hansen</a>, <a href="/search/?searchtype=author&query=Hauf%2C+S">Steffen Hauf</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/?searchtype=author&query=K%C3%A4mmerer%2C+L">Lea K盲mmerer</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Lomidze%2C+D">David Lomidze</a>, <a href="/search/?searchtype=author&query=Maffessanti%2C+S">Stefano Maffessanti</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Miedema%2C+P+S">Piter S. Miedema</a> , et al. (19 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2412.05151v1-abstract-short" style="display: inline;"> Time-resolved X-ray absorption spectroscopy (tr-XAS) has been shown to be a versatile measurement technique for investigating non-equilibrium dynamics. Novel X-ray free electron laser (XFEL) facilities like the European XFEL offer increased repetition rates for stroboscopic XAS experiments through a burst operation mode, which enables measurements with up to 4.5 MHz. These higher repetition rates… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.05151v1-abstract-full').style.display = 'inline'; document.getElementById('2412.05151v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.05151v1-abstract-full" style="display: none;"> Time-resolved X-ray absorption spectroscopy (tr-XAS) has been shown to be a versatile measurement technique for investigating non-equilibrium dynamics. Novel X-ray free electron laser (XFEL) facilities like the European XFEL offer increased repetition rates for stroboscopic XAS experiments through a burst operation mode, which enables measurements with up to 4.5 MHz. These higher repetition rates lead to higher data acquisition rates but can also introduce long-lived excitations that persist and thus build up during each burst. Here, we report on such long-lived effects in Ni and NiO thin film samples that were measured at the European XFEL. We disentangle the long-lived excitations from the initial pump-induced change and perform a detailed modelling-based analysis of how they modify transient X-ray spectra. As a result, we link the long-lived effects in Ni to a local temperature increase, as well as the effects in NiO to excited charge carrier trapping through polaron formation. In addition, we present possible correction methods, as well as discuss ways in which the effects of these long-lived excitations could be minimized for future time-resolved X-ray absorption spectroscopy measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.05151v1-abstract-full').style.display = 'none'; document.getElementById('2412.05151v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.10145">arXiv:2305.10145</a> <span> [<a href="https://arxiv.org/pdf/2305.10145">pdf</a>, <a href="https://arxiv.org/format/2305.10145">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.110.245120">10.1103/PhysRevB.110.245120 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photo-induced charge-transfer renormalization in NiO </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Lojewski%2C+T">Tobias Lojewski</a>, <a href="/search/?searchtype=author&query=Golez%2C+D">Denis Golez</a>, <a href="/search/?searchtype=author&query=Ollefs%2C+K">Katharina Ollefs</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=K%C3%A4mmerer%2C+L">Lea K盲mmerer</a>, <a href="/search/?searchtype=author&query=Rothenbach%2C+N">Nico Rothenbach</a>, <a href="/search/?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/?searchtype=author&query=Miedema%2C+P+S">Piter S. Miedema</a>, <a href="/search/?searchtype=author&query=Beye%2C+M">Martin Beye</a>, <a href="/search/?searchtype=author&query=Chiuzb%C4%83ian%2C+G+S">Gheorghe S. Chiuzb膬ian</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">Justina Schlappa</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">Andreas Scherz</a>, <a href="/search/?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/?searchtype=author&query=David%2C+C">Christian David</a>, <a href="/search/?searchtype=author&query=Wende%2C+H">Heiko Wende</a>, <a href="/search/?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</a>, <a href="/search/?searchtype=author&query=Eckstein%2C+M">Martin Eckstein</a>, <a href="/search/?searchtype=author&query=Werner%2C+P">Philipp Werner</a>, <a href="/search/?searchtype=author&query=Eschenlohr%2C+A">Andrea Eschenlohr</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.10145v2-abstract-short" style="display: inline;"> Photo-doped states in strongly correlated charge transfer insulators are characterized by $d$-$d$ and $d$-$p$ interactions and the resulting intertwined dynamics of charge excitations and local multiplets. Here we use femtosecond x-ray absorption spectroscopy in combination with dynamical mean-field theory to disentangle these contributions in NiO. Upon resonant optical excitation across the charg… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.10145v2-abstract-full').style.display = 'inline'; document.getElementById('2305.10145v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.10145v2-abstract-full" style="display: none;"> Photo-doped states in strongly correlated charge transfer insulators are characterized by $d$-$d$ and $d$-$p$ interactions and the resulting intertwined dynamics of charge excitations and local multiplets. Here we use femtosecond x-ray absorption spectroscopy in combination with dynamical mean-field theory to disentangle these contributions in NiO. Upon resonant optical excitation across the charge transfer gap, the Ni $L_3$ and O $K$ absorption edges red-shift for $>10$ ps, associated with photo-induced changes in the screening environment. An additional signature below the Ni $L_3$ edge is identified for $<1$ ps, reflecting a transient nonthermal population of local many-body multiplets. We employ a nonthermal generalization of the multiplet ligand field theory to show that the feature originates from $d$-$d$ transitions. Overall, the photo-doped state differs significantly from a chemically doped state. Our results demonstrate the ability to reveal excitation pathways in correlated materials by x-ray spectroscopies, which is relevant for ultrafast materials design. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.10145v2-abstract-full').style.display = 'none'; document.getElementById('2305.10145v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 110, 245120 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.08890">arXiv:2304.08890</a> <span> [<a href="https://arxiv.org/pdf/2304.08890">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1002/advs.202302550">10.1002/advs.202302550 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transient non-collinear magnetic state for all-optical magnetization switching </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Parchenko%2C+S">Sergii Parchenko</a>, <a href="/search/?searchtype=author&query=Frej%2C+A">Antoni Frej</a>, <a href="/search/?searchtype=author&query=Ueda%2C+H">Hiroki Ueda</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">Justine Schlappa</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">Andreas Scherz</a>, <a href="/search/?searchtype=author&query=Zvezdin%2C+A">Anatoly Zvezdin</a>, <a href="/search/?searchtype=author&query=Stupakiewicz%2C+A">Andrzej Stupakiewicz</a>, <a href="/search/?searchtype=author&query=Staub%2C+U">Urs Staub</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2304.08890v1-abstract-short" style="display: inline;"> Resonant absorption of a photon by bound electrons in a solid can promote an electron to another orbital state or transfer it to a neighboring atomic site. Such a transition in a magnetically ordered material could affect the magnetic order. While this process is an obvious road map for optical control of magnetization, experimental demonstration of such a process remains challenging. Exciting a s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.08890v1-abstract-full').style.display = 'inline'; document.getElementById('2304.08890v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.08890v1-abstract-full" style="display: none;"> Resonant absorption of a photon by bound electrons in a solid can promote an electron to another orbital state or transfer it to a neighboring atomic site. Such a transition in a magnetically ordered material could affect the magnetic order. While this process is an obvious road map for optical control of magnetization, experimental demonstration of such a process remains challenging. Exciting a significant fraction of magnetic ions requires a very intense incoming light beam, as orbital resonances are often weak compared to above-band-gap excitations. In the latter case, a sizeable reduction of the magnetization occurs as the absorbed energy increases the spin temperature, masking the non-thermal optical effects. Here, using ultrafast x-ray spectroscopy, we were able to resolve changes in the magnetization state induced by resonant absorption of infrared photons in Co-doped yttrium iron garnet, with negligible thermal effects. We found that the optical excitation of the Co ions affects the two distinct magnetic Fe sublattices differently, resulting in a transient non-collinear magnetic state. The present results indicate that the all-optical magnetization switching most likely occurs due to the creation of a transient, non-collinear magnetic state followed by coherent spin rotations of the Fe moments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.08890v1-abstract-full').style.display = 'none'; document.getElementById('2304.08890v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Adv. Sci. 10, 2302550 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.04265">arXiv:2211.04265</a> <span> [<a href="https://arxiv.org/pdf/2211.04265">pdf</a>, <a href="https://arxiv.org/format/2211.04265">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1107/S1600577523000619">10.1107/S1600577523000619 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photon shot-noise limited transient absorption soft X-ray spectroscopy at the European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Eschenlohr%2C+A">Andrea Eschenlohr</a>, <a href="/search/?searchtype=author&query=Beye%2C+M">Martin Beye</a>, <a href="/search/?searchtype=author&query=Schlotter%2C+W">William Schlotter</a>, <a href="/search/?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/?searchtype=author&query=Carinan%2C+C">Cammille Carinan</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</a>, <a href="/search/?searchtype=author&query=Buck%2C+J">Jens Buck</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/?searchtype=author&query=D%27Elia%2C+A">Alessandro D'Elia</a>, <a href="/search/?searchtype=author&query=Delitz%2C+J">Jan-Torben Delitz</a>, <a href="/search/?searchtype=author&query=Ehsan%2C+W">Wajid Ehsan</a>, <a href="/search/?searchtype=author&query=Engel%2C+R">Robin Engel</a>, <a href="/search/?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/?searchtype=author&query=Fischer%2C+P">Peter Fischer</a>, <a href="/search/?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/?searchtype=author&query=F%C3%B6hlisch%2C+A">Alexander F枚hlisch</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Gensch%2C+M">Michael Gensch</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a> , et al. (39 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.04265v3-abstract-short" style="display: inline;"> Femtosecond transient soft X-ray Absorption Spectroscopy (XAS) is a very promising technique that can be employed at X-ray Free Electron Lasers (FELs) to investigate out-of-equilibrium dynamics for material and energy research. Here we present a dedicated setup for soft X-rays available at the Spectroscopy & Coherent Scattering (SCS) instrument at the European X-ray Free Electron Laser (EuXFEL). I… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.04265v3-abstract-full').style.display = 'inline'; document.getElementById('2211.04265v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.04265v3-abstract-full" style="display: none;"> Femtosecond transient soft X-ray Absorption Spectroscopy (XAS) is a very promising technique that can be employed at X-ray Free Electron Lasers (FELs) to investigate out-of-equilibrium dynamics for material and energy research. Here we present a dedicated setup for soft X-rays available at the Spectroscopy & Coherent Scattering (SCS) instrument at the European X-ray Free Electron Laser (EuXFEL). It consists of a beam-splitting off-axis zone plate (BOZ) used in transmission to create three copies of the incoming beam, which are used to measure the transmitted intensity through the excited and unexcited sample, as well as to monitor the incoming intensity. Since these three intensity signals are detected shot-by-shot and simultaneously, this setup allows normalized shot-by-shot analysis of the transmission. For photon detection, the DSSC imaging detector, which is capable of recording up to 800 images at 4.5 MHz frame rate during the FEL burst, is employed and allows approaching the photon shot-noise limit. We review the setup and its capabilities, as well as the online and offline analysis tools provided to users. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.04265v3-abstract-full').style.display = 'none'; document.getElementById('2211.04265v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Synchrotron Rad. (2023). 30, 284-300 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.13162">arXiv:2210.13162</a> <span> [<a href="https://arxiv.org/pdf/2210.13162">pdf</a>, <a href="https://arxiv.org/format/2210.13162">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1080/21663831.2023.2210606">10.1080/21663831.2023.2210606 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The interplay of local electron correlations and ultrafast spin dynamics in fcc Ni </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Lojewski%2C+T">Tobias Lojewski</a>, <a href="/search/?searchtype=author&query=Elhanoty%2C+M+F">Mohamed F. Elhanoty</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Gr%C3%A5n%C3%A4s%2C+O">Oscar Gr氓n盲s</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/?searchtype=author&query=David%2C+C">Christian David</a>, <a href="/search/?searchtype=author&query=Deiter%2C+C">Carsten Deiter</a>, <a href="/search/?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/?searchtype=author&query=Fischer%2C+P">Peter Fischer</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=de+Groot%2C+F">Frank de Groot</a>, <a href="/search/?searchtype=author&query=Hansen%2C+K">Karsten Hansen</a>, <a href="/search/?searchtype=author&query=Hauf%2C+S">Steffen Hauf</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Kvashnin%2C+Y">Yaroslav Kvashnin</a> , et al. (26 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.13162v1-abstract-short" style="display: inline;"> The complex electronic structure of metallic ferromagnets is determined by a balance between exchange interaction, electron hopping leading to band formation, and local Coulomb repulsion. The interplay between the respective terms of the Hamiltonian is of fundamental interest, since it produces most, if not all, of the exotic phenomena observed in the solid state. By combining high energy and temp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.13162v1-abstract-full').style.display = 'inline'; document.getElementById('2210.13162v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.13162v1-abstract-full" style="display: none;"> The complex electronic structure of metallic ferromagnets is determined by a balance between exchange interaction, electron hopping leading to band formation, and local Coulomb repulsion. The interplay between the respective terms of the Hamiltonian is of fundamental interest, since it produces most, if not all, of the exotic phenomena observed in the solid state. By combining high energy and temporal resolution in femtosecond time-resolved X-ray absorption spectroscopy with ab initio time-dependent density functional theory we analyze the electronic structure in fcc Ni on the time scale of these interactions in a pump-probe experiment. We distinguish transient broadening and energy shifts in the absorption spectra, which we demonstrate to be caused by electron repopulation and correlation-induced modifications of the electronic structure, respectively. Importantly, the theoretical description of this experimental result hence requires to take the local Coulomb interaction into account, revealing a temporal interplay between band formation, exchange interaction, and Coulomb repulsion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.13162v1-abstract-full').style.display = 'none'; document.getElementById('2210.13162v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Materials Research Letters 11, 655-661 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2206.08729">arXiv:2206.08729</a> <span> [<a href="https://arxiv.org/pdf/2206.08729">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Monochromatic operation of the SASE3 soft X-ray beamline at European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Gerasimova%2C+N">N. Gerasimova</a>, <a href="/search/?searchtype=author&query=La+Civita%2C+D">D. La Civita</a>, <a href="/search/?searchtype=author&query=Samoylova%2C+L">L. Samoylova</a>, <a href="/search/?searchtype=author&query=Vannoni%2C+M">M. Vannoni</a>, <a href="/search/?searchtype=author&query=Villanueva%2C+R">R. Villanueva</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">D. Hickin</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">R. Carley</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B">B. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Miedema%2C+P">P. Miedema</a>, <a href="/search/?searchtype=author&query=Guyarder%2C+L+L">L. Le Guyarder</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">L. Mercadier</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">G. Mercurio</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">J. Schlappa</a>, <a href="/search/?searchtype=author&query=Teichman%2C+M">M. Teichman</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">A. Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Sinn%2C+H">H. Sinn</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">A. Scherz</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2206.08729v1-abstract-short" style="display: inline;"> The SASE3 soft X-ray beamline at the European XFEL has been designed and built to provide experiments with pink or monochromatic beam in the photon energy range 250 eV - 3000 eV. Here, we focus on the monochromatic operation of the SASE3 beamline and report on design and performance of the SASE3 grating monochromator. The unique capability of an FEL source to produce short femtosecond pulses of hi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.08729v1-abstract-full').style.display = 'inline'; document.getElementById('2206.08729v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2206.08729v1-abstract-full" style="display: none;"> The SASE3 soft X-ray beamline at the European XFEL has been designed and built to provide experiments with pink or monochromatic beam in the photon energy range 250 eV - 3000 eV. Here, we focus on the monochromatic operation of the SASE3 beamline and report on design and performance of the SASE3 grating monochromator. The unique capability of an FEL source to produce short femtosecond pulses of high degree of coherence challenges the monochromator design by a demand to control both photon energy and temporal resolution. The aim to transport close to transform-limited pulses poses very high demands on the optics quality, in particular on the grating. The current realization of the SASE3 monochromator is discussed in comparison with optimal design performance. Presently, the monochromator operates with two gratings: the low-resolution grating is optimized for time-resolved experiments and allows for moderate resolving power of about 2000 - 5000 along with pulse stretching of few to few tens of femtoseconds RMS, and the high-resolution grating reaches resolving power of 10000 at a cost of larger pulse stretching. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.08729v1-abstract-full').style.display = 'none'; document.getElementById('2206.08729v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.06350">arXiv:2201.06350</a> <span> [<a href="https://arxiv.org/pdf/2201.06350">pdf</a>, <a href="https://arxiv.org/format/2201.06350">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1107/S1600577522008414">10.1107/S1600577522008414 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Megahertz-rate Ultrafast X-ray Scattering and Holographic Imaging at the European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Hagstr%C3%B6m%2C+N+Z">Nanna Zhou Hagstr枚m</a>, <a href="/search/?searchtype=author&query=Schneider%2C+M">Michael Schneider</a>, <a href="/search/?searchtype=author&query=Kerber%2C+N">Nico Kerber</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Parra%2C+E+B">Erick Burgos Parra</a>, <a href="/search/?searchtype=author&query=Beg%2C+M">Marijan Beg</a>, <a href="/search/?searchtype=author&query=Lang%2C+M">Martin Lang</a>, <a href="/search/?searchtype=author&query=G%C3%BCnther%2C+C+M">Christian M. G眉nther</a>, <a href="/search/?searchtype=author&query=Seng%2C+B">Boris Seng</a>, <a href="/search/?searchtype=author&query=Kammerbauer%2C+F">Fabian Kammerbauer</a>, <a href="/search/?searchtype=author&query=Popescu%2C+H">Horia Popescu</a>, <a href="/search/?searchtype=author&query=Pancaldi%2C+M">Matteo Pancaldi</a>, <a href="/search/?searchtype=author&query=Neeraj%2C+K">Kumar Neeraj</a>, <a href="/search/?searchtype=author&query=Polley%2C+D">Debanjan Polley</a>, <a href="/search/?searchtype=author&query=Jangid%2C+R">Rahul Jangid</a>, <a href="/search/?searchtype=author&query=Hrkac%2C+S+B">Stjepan B. Hrkac</a>, <a href="/search/?searchtype=author&query=Patel%2C+S+K+K">Sheena K. K. Patel</a>, <a href="/search/?searchtype=author&query=Ovcharenko%2C+S">Sergei Ovcharenko</a>, <a href="/search/?searchtype=author&query=Turenne%2C+D">Diego Turenne</a>, <a href="/search/?searchtype=author&query=Ksenzov%2C+D">Dmitriy Ksenzov</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Pronin%2C+I">Igor Pronin</a>, <a href="/search/?searchtype=author&query=Baidakova%2C+M">Marina Baidakova</a>, <a href="/search/?searchtype=author&query=Schmising%2C+C+v+K">Clemens von Korff Schmising</a>, <a href="/search/?searchtype=author&query=Borchert%2C+M">Martin Borchert</a> , et al. (75 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2201.06350v2-abstract-short" style="display: inline;"> The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, from chemistry to biology, giving researchers access to X-rays with unprecedented brightness, coherence, and pulse duration. All XFEL facilities built until recently provided X-ray pulses at a relatively low repetition rate, with limited data statistics. Here, we presen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.06350v2-abstract-full').style.display = 'inline'; document.getElementById('2201.06350v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.06350v2-abstract-full" style="display: none;"> The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, from chemistry to biology, giving researchers access to X-rays with unprecedented brightness, coherence, and pulse duration. All XFEL facilities built until recently provided X-ray pulses at a relatively low repetition rate, with limited data statistics. Here, we present the results from the first megahertz repetition rate X-ray scattering experiments at the Spectroscopy and Coherent Scattering (SCS) instrument of the European XFEL. We illustrate the experimental capabilities that the SCS instrument offers, resulting from the operation at MHz repetition rates and the availability of the novel DSSC 2D imaging detector. Time-resolved magnetic X-ray scattering and holographic imaging experiments in solid state samples were chosen as representative, providing an ideal test-bed for operation at megahertz rates. Our results are relevant and applicable to any other non-destructive XFEL experiments in the soft X-ray range. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.06350v2-abstract-full').style.display = 'none'; document.getElementById('2201.06350v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 5 figures. Supplementary Information as ancillary file</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Synchrotron Rad. (2022), 29 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.09587">arXiv:2112.09587</a> <span> [<a href="https://arxiv.org/pdf/2112.09587">pdf</a>, <a href="https://arxiv.org/format/2112.09587">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Hagstr%C3%B6m%2C+N+Z">Nanna Zhou Hagstr枚m</a>, <a href="/search/?searchtype=author&query=Jangid%2C+R">Rahul Jangid</a>, <a href="/search/?searchtype=author&query=Meera"> Meera</a>, <a href="/search/?searchtype=author&query=Turenne%2C+D">Diego Turenne</a>, <a href="/search/?searchtype=author&query=Brock%2C+J">Jeffrey Brock</a>, <a href="/search/?searchtype=author&query=Lamb%2C+E+S">Erik S. Lamb</a>, <a href="/search/?searchtype=author&query=Stoychev%2C+B">Boyan Stoychev</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">Justine Schlappa</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B">Benjamin Van Kuiken</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Samartsev%2C+A">Andrey Samartsev</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">Andreas Scherz</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=D%C3%BCrr%2C+H+A">Hermann A. D眉rr</a>, <a href="/search/?searchtype=author&query=Reid%2C+A+H">Alexander H. Reid</a>, <a href="/search/?searchtype=author&query=Arora%2C+M">Monika Arora</a>, <a href="/search/?searchtype=author&query=Nembach%2C+H+T">Hans T. Nembach</a>, <a href="/search/?searchtype=author&query=Shaw%2C+J+M">Justin M. Shaw</a>, <a href="/search/?searchtype=author&query=Jal%2C+E">Emmanuelle Jal</a>, <a href="/search/?searchtype=author&query=Fullerton%2C+E+E">Eric E. Fullerton</a>, <a href="/search/?searchtype=author&query=Keller%2C+M+W">Mark W. Keller</a>, <a href="/search/?searchtype=author&query=Kukreja%2C+R">Roopali Kukreja</a> , et al. (3 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.09587v1-abstract-short" style="display: inline;"> Symmetry is a powerful concept in physics, but its applicability to far-from-equilibrium states is still being understood. Recent attention has focused on how far-from-equilibrium states lead to spontaneous symmetry breaking. Conversely, ultrafast optical pumping can be used to drastically change the energy landscape and quench the magnetic order parameter in magnetic systems. Here, we find a dist… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.09587v1-abstract-full').style.display = 'inline'; document.getElementById('2112.09587v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.09587v1-abstract-full" style="display: none;"> Symmetry is a powerful concept in physics, but its applicability to far-from-equilibrium states is still being understood. Recent attention has focused on how far-from-equilibrium states lead to spontaneous symmetry breaking. Conversely, ultrafast optical pumping can be used to drastically change the energy landscape and quench the magnetic order parameter in magnetic systems. Here, we find a distinct symmetry-dependent ultrafast behaviour by use of ultrafast x-ray scattering from magnetic patterns with varying degrees of isotropic and anisotropic symmetry. After pumping with an optical laser, the scattered intensity reveals a radial shift exclusive to the isotropic component and exhibits a faster recovery time from quenching for the anisotropic component. These features arise even when both symmetry components are concurrently measured, suggesting a correspondence between the excitation and the magnetic order symmetry. Our results underline the importance of symmetry as a critical variable to manipulate the magnetic order in the ultrafast regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.09587v1-abstract-full').style.display = 'none'; document.getElementById('2112.09587v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.01649">arXiv:2111.01649</a> <span> [<a href="https://arxiv.org/pdf/2111.01649">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Non-equilibrium self-assembly of spin-wave solitons in FePt nanoparticles </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Turenne%2C+D">D. Turenne</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">A. Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Wang%2C+X">X. Wang</a>, <a href="/search/?searchtype=author&query=Unikandanuni%2C+V">V. Unikandanuni</a>, <a href="/search/?searchtype=author&query=Vaskivskyi%2C+I">I. Vaskivskyi</a>, <a href="/search/?searchtype=author&query=Schneider%2C+M">M. Schneider</a>, <a href="/search/?searchtype=author&query=Jal%2C+E">E. Jal</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">R. Carley</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">G. Mercurio</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">N. Agarwal</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B">B. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">L. Mercadier</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">J. Schlappa</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">L. Le Guyader</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">N. Gerasimova</a>, <a href="/search/?searchtype=author&query=Teichmann%2C+M">M. Teichmann</a>, <a href="/search/?searchtype=author&query=Lomidze%2C+D">D. Lomidze</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">A. Castoldi</a>, <a href="/search/?searchtype=author&query=Potorochin%2C+D">D. Potorochin</a>, <a href="/search/?searchtype=author&query=Mukkattukavil%2C+D">D. Mukkattukavil</a>, <a href="/search/?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/?searchtype=author&query=Hagstr%C3%B6m%2C+N+Z">N. Z. Hagstr枚m</a>, <a href="/search/?searchtype=author&query=Reid%2C+A+H">A. H. Reid</a>, <a href="/search/?searchtype=author&query=Shen%2C+X">X. Shen</a> , et al. (14 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2111.01649v1-abstract-short" style="display: inline;"> Magnetic nanoparticles such as FePt in the L10-phase are the bedrock of our current data storage technology. As the grains become smaller to keep up with technological demands, the superparamagnetic limit calls for materials with higher magneto-crystalline anisotropy. This in turn reduces the magnetic exchange length to just a few nanometers enabling magnetic structures to be induced within the na… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.01649v1-abstract-full').style.display = 'inline'; document.getElementById('2111.01649v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.01649v1-abstract-full" style="display: none;"> Magnetic nanoparticles such as FePt in the L10-phase are the bedrock of our current data storage technology. As the grains become smaller to keep up with technological demands, the superparamagnetic limit calls for materials with higher magneto-crystalline anisotropy. This in turn reduces the magnetic exchange length to just a few nanometers enabling magnetic structures to be induced within the nanoparticles. Here we describe the existence of spin-wave solitons, dynamic localized bound states of spin-wave excitations, in FePt nanoparticles. We show with time-resolved X-ray diffraction and micromagnetic modeling that spin-wave solitons of sub-10 nm sizes form out of the demagnetized state following femtosecond laser excitation. The measured soliton spin-precession frequency of 0.1 THz positions this system as a platform to develop miniature devices capable of filling the THz gap. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.01649v1-abstract-full').style.display = 'none'; document.getElementById('2111.01649v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">32 pages, please check the "attachemnts" tab in the pdf file in order to see the movie</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.09999">arXiv:2106.09999</a> <span> [<a href="https://arxiv.org/pdf/2106.09999">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Optical control of 4f orbital state in rare-earth metals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Thielemann-K%C3%BChn%2C+N">N. Thielemann-K眉hn</a>, <a href="/search/?searchtype=author&query=Amrhein%2C+T">T. Amrhein</a>, <a href="/search/?searchtype=author&query=Bronsch%2C+W">W. Bronsch</a>, <a href="/search/?searchtype=author&query=Jana%2C+S">S. Jana</a>, <a href="/search/?searchtype=author&query=Pontius%2C+N">N. Pontius</a>, <a href="/search/?searchtype=author&query=Engel%2C+R+Y">R. Y. Engel</a>, <a href="/search/?searchtype=author&query=Miedema%2C+P+S">P. S. Miedema</a>, <a href="/search/?searchtype=author&query=Legut%2C+D">D. Legut</a>, <a href="/search/?searchtype=author&query=Carva%2C+K">K. Carva</a>, <a href="/search/?searchtype=author&query=Atxitia%2C+U">U. Atxitia</a>, <a href="/search/?searchtype=author&query=van+Kuiken%2C+B+E">B. E. van Kuiken</a>, <a href="/search/?searchtype=author&query=Teichmann%2C+M">M. Teichmann</a>, <a href="/search/?searchtype=author&query=Carley%2C+R+E">R. E. Carley</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">L. Mercadier</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">A. Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">G. Mercurio</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">L. Le Guyader</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">N. Agarwal</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">A. Scherz</a>, <a href="/search/?searchtype=author&query=Dziarzhytski%2C+S">S. Dziarzhytski</a>, <a href="/search/?searchtype=author&query=Brenner%2C+G">G. Brenner</a>, <a href="/search/?searchtype=author&query=Pressacco%2C+F">F. Pressacco</a>, <a href="/search/?searchtype=author&query=Wang%2C+R">R. Wang</a>, <a href="/search/?searchtype=author&query=Schunck%2C+J+O">J. O. Schunck</a> , et al. (6 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2106.09999v4-abstract-short" style="display: inline;"> A change of orbital state alters the coupling between ions and their surroundings drastically. Orbital excitations are hence key to understand and control interaction of ions. Rare-earth (RE) elements with strong magneto-crystalline anisotropy (MCA) are important ingredients for magnetic devices. Thus, control of their localized 4f magnetic moments and anisotropy is one major challenge in ultrafas… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.09999v4-abstract-full').style.display = 'inline'; document.getElementById('2106.09999v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.09999v4-abstract-full" style="display: none;"> A change of orbital state alters the coupling between ions and their surroundings drastically. Orbital excitations are hence key to understand and control interaction of ions. Rare-earth (RE) elements with strong magneto-crystalline anisotropy (MCA) are important ingredients for magnetic devices. Thus, control of their localized 4f magnetic moments and anisotropy is one major challenge in ultrafast spin physics. With time-resolved X-ray absorption and resonant inelastic scattering experiments, we show for Tb metal that 4f-electronic excitations out of the ground state multiplet occur after optical pumping. These excitations are driven by inelastic 5d-4f-electron scattering, alter the 4f-orbital state and consequently the MCA with important implications for magnetization dynamics in 4f-metals, and more general for the excitation of localized electronic states in correlated materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.09999v4-abstract-full').style.display = 'none'; document.getElementById('2106.09999v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Manuscript (23 pages, 5 figures) and Supplementary Information (32 pages, 10 figures)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2105.10472">arXiv:2105.10472</a> <span> [<a href="https://arxiv.org/pdf/2105.10472">pdf</a>, <a href="https://arxiv.org/format/2105.10472">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.104.L161104">10.1103/PhysRevB.104.L161104 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ultrafast electronic line width broadening in the C 1s core level of graphene </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Curcio%2C+D">Davide Curcio</a>, <a href="/search/?searchtype=author&query=Pakdel%2C+S">Sahar Pakdel</a>, <a href="/search/?searchtype=author&query=Volckaert%2C+K">Klara Volckaert</a>, <a href="/search/?searchtype=author&query=Miwa%2C+J+A">Jill A. Miwa</a>, <a href="/search/?searchtype=author&query=Ulstrup%2C+S">S酶ren Ulstrup</a>, <a href="/search/?searchtype=author&query=Lanat%C3%A0%2C+N">Nicola Lanat脿</a>, <a href="/search/?searchtype=author&query=Bianchi%2C+M">Marco Bianchi</a>, <a href="/search/?searchtype=author&query=Kutnyakhov%2C+D">Dmytro Kutnyakhov</a>, <a href="/search/?searchtype=author&query=Pressacco%2C+F">Federico Pressacco</a>, <a href="/search/?searchtype=author&query=Brenner%2C+G">G眉nter Brenner</a>, <a href="/search/?searchtype=author&query=Dziarzhytski%2C+S">Siarhei Dziarzhytski</a>, <a href="/search/?searchtype=author&query=Redlin%2C+H">Harald Redlin</a>, <a href="/search/?searchtype=author&query=Agustsson%2C+S">Steinn Agustsson</a>, <a href="/search/?searchtype=author&query=Medjanik%2C+K">Katerina Medjanik</a>, <a href="/search/?searchtype=author&query=Vasilyev%2C+D">Dmitry Vasilyev</a>, <a href="/search/?searchtype=author&query=Elmers%2C+H">Hans-Joachim Elmers</a>, <a href="/search/?searchtype=author&query=Sch%C3%B6nhense%2C+G">Gerd Sch枚nhense</a>, <a href="/search/?searchtype=author&query=Tusche%2C+C">Christian Tusche</a>, <a href="/search/?searchtype=author&query=Chen%2C+Y">Ying-Jiun Chen</a>, <a href="/search/?searchtype=author&query=Speck%2C+F">Florian Speck</a>, <a href="/search/?searchtype=author&query=Seyller%2C+T">Thomas Seyller</a>, <a href="/search/?searchtype=author&query=B%C3%BChlmann%2C+K">Kevin B眉hlmann</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=Diekmann%2C+F">Florian Diekmann</a>, <a href="/search/?searchtype=author&query=Rossnagel%2C+K">Kai Rossnagel</a> , et al. (9 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2105.10472v1-abstract-short" style="display: inline;"> Core level binding energies and absorption edges are at the heart of many experimental techniques concerned with element-specific structure, electronic structure, chemical reactivity, elementary excitations and magnetism. X-ray photoemission spectroscopy (XPS) in particular, can provide information about the electronic and vibrational many-body interactions in a solid as these are reflected in the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.10472v1-abstract-full').style.display = 'inline'; document.getElementById('2105.10472v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.10472v1-abstract-full" style="display: none;"> Core level binding energies and absorption edges are at the heart of many experimental techniques concerned with element-specific structure, electronic structure, chemical reactivity, elementary excitations and magnetism. X-ray photoemission spectroscopy (XPS) in particular, can provide information about the electronic and vibrational many-body interactions in a solid as these are reflected in the detailed energy distribution of the photoelectrons. Ultrafast pump-probe techniques add a new dimension to such studies, introducing the ability to probe a transient state of the many-body system. Here we use a free electron laser to investigate the effect of a transiently excited electron gas on the core level spectrum of graphene, showing that it leads to a large broadening of the C 1s peak. Confirming a decade-old prediction, the broadening is found to be caused by an exchange of energy and momentum between the photoemitted core electron and the hot electron system, rather than by vibrational excitations. This interpretation is supported by a line shape analysis that accounts for the presence of the excited electrons. Fitting the spectra to this model directly yields the electronic temperature of the system, in agreement with electronic temperature values obtained from valence band data. Furthermore, making use of time- and momentum-resolved C 1s spectra, we illustrate how the momentum change of the outgoing core electrons leads to a small but detectable change in the time-resolved photoelectron diffraction pattern and to a nearly complete elimination of the core level binding energy variation associated with the narrow $蟽$-band in the C 1s state. The results demonstrate that the XPS line shape can be used as an element-specific and local probe of the excited electron system and that X-ray photoelectron diffraction investigations remain feasible at very high electronic temperatures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.10472v1-abstract-full').style.display = 'none'; document.getElementById('2105.10472v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 104, 161104 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.11030">arXiv:2006.11030</a> <span> [<a href="https://arxiv.org/pdf/2006.11030">pdf</a>, <a href="https://arxiv.org/ps/2006.11030">ps</a>, <a href="https://arxiv.org/format/2006.11030">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0006095">10.1063/5.0006095 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> X-ray detection of ultrashort spin current pulses in synthetic antiferromagnets </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Stamm%2C+C">C. Stamm</a>, <a href="/search/?searchtype=author&query=Murer%2C+C">C. Murer</a>, <a href="/search/?searchtype=author&query=W%C3%B6rnle%2C+M+S">M. S. W枚rnle</a>, <a href="/search/?searchtype=author&query=Acremann%2C+Y">Y. Acremann</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/?searchtype=author&query=D%C3%A4ster%2C+S">S. D盲ster</a>, <a href="/search/?searchtype=author&query=Reid%2C+A+H">A. H. Reid</a>, <a href="/search/?searchtype=author&query=Higley%2C+D+J">D. J. Higley</a>, <a href="/search/?searchtype=author&query=Wandel%2C+S+F">S. F. Wandel</a>, <a href="/search/?searchtype=author&query=Schlotter%2C+W+F">W. F. Schlotter</a>, <a href="/search/?searchtype=author&query=Gambardella%2C+P">P. Gambardella</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.11030v1-abstract-short" style="display: inline;"> We explore the ultrafast generation of spin currents in magnetic multilayer samples by applying fs laser pulses to one layer and measuring the magnetic response in the other layer by element-resolved x-ray spectroscopy. In Ni(5~nm)/Ru(2~nm)/Fe(4~nm), the Ni and Fe magnetization directions couple antiferromagnetically due to the RKKY interaction, but may be oriented parallel through an applied magn… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.11030v1-abstract-full').style.display = 'inline'; document.getElementById('2006.11030v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.11030v1-abstract-full" style="display: none;"> We explore the ultrafast generation of spin currents in magnetic multilayer samples by applying fs laser pulses to one layer and measuring the magnetic response in the other layer by element-resolved x-ray spectroscopy. In Ni(5~nm)/Ru(2~nm)/Fe(4~nm), the Ni and Fe magnetization directions couple antiferromagnetically due to the RKKY interaction, but may be oriented parallel through an applied magnetic field. After exciting the top Ni layer with a fs laser pulse, we find that also the Fe layer underneath demagnetizes, with a $4.1 \pm 1.9$\% amplitude difference between parallel and antiparallel orientation of the Ni and Fe magnetizations. We attribute this difference to the influence of a spin current generated by the fs laser pulse that transfers angular momentum from the Ni into the Fe layer. Our results confirm that superdiffusive spin transport plays a role in determining the sub-ps demagnetization dynamics of synthetic antiferromagnetic layers, but also evidence large depolarization effects due to hot electron dynamics, which are independent of the relative alignment of the magnetization in Ni and Fe. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.11030v1-abstract-full').style.display = 'none'; document.getElementById('2006.11030v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Applied Physics 127, 223902 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1906.12155">arXiv:1906.12155</a> <span> [<a href="https://arxiv.org/pdf/1906.12155">pdf</a>, <a href="https://arxiv.org/format/1906.12155">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.5118777">10.1063/1.5118777 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Time- and momentum-resolved photoemission studies using time-of-flight momentum microscopy at a free-electron laser </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Kutnyakhov%2C+D">Dmytro Kutnyakhov</a>, <a href="/search/?searchtype=author&query=Xian%2C+R+P">Rui Patrick Xian</a>, <a href="/search/?searchtype=author&query=Dendzik%2C+M">Maciej Dendzik</a>, <a href="/search/?searchtype=author&query=Heber%2C+M">Michael Heber</a>, <a href="/search/?searchtype=author&query=Pressacco%2C+F">Federico Pressacco</a>, <a href="/search/?searchtype=author&query=Agustsson%2C+S+Y">Steinn Ymir Agustsson</a>, <a href="/search/?searchtype=author&query=Wenthaus%2C+L">Lukas Wenthaus</a>, <a href="/search/?searchtype=author&query=Meyer%2C+H">Holger Meyer</a>, <a href="/search/?searchtype=author&query=Gieschen%2C+S">Sven Gieschen</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Benz%2C+A">Adrian Benz</a>, <a href="/search/?searchtype=author&query=B%C3%BChlman%2C+K">Kevin B眉hlman</a>, <a href="/search/?searchtype=author&query=D%C3%A4ster%2C+S">Simon D盲ster</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=Curcio%2C+D">Davide Curcio</a>, <a href="/search/?searchtype=author&query=Volckaert%2C+K">Klara Volckaert</a>, <a href="/search/?searchtype=author&query=Bianchi%2C+M">Marco Bianchi</a>, <a href="/search/?searchtype=author&query=Sanders%2C+C">Charlotte Sanders</a>, <a href="/search/?searchtype=author&query=Miwa%2C+J+A">Jill Atsuko Miwa</a>, <a href="/search/?searchtype=author&query=Ulstrup%2C+S">S酶ren Ulstrup</a>, <a href="/search/?searchtype=author&query=Oelsner%2C+A">Andreas Oelsner</a>, <a href="/search/?searchtype=author&query=Tusche%2C+C">Christian Tusche</a>, <a href="/search/?searchtype=author&query=Chen%2C+Y">Ying-Jiun Chen</a>, <a href="/search/?searchtype=author&query=Vasilyev%2C+D">Dmitrii Vasilyev</a>, <a href="/search/?searchtype=author&query=Medjanik%2C+K">Katerina Medjanik</a> , et al. (16 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1906.12155v3-abstract-short" style="display: inline;"> Time-resolved photoemission with ultrafast pump and probe pulses is an emerging technique with wide application potential. Real-time recording of non-equilibrium electronic processes, transient states in chemical reactions or the interplay of electronic and structural dynamics offers fascinating opportunities for future research. Combining valence-band and core-level spectroscopy with photoelectro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.12155v3-abstract-full').style.display = 'inline'; document.getElementById('1906.12155v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1906.12155v3-abstract-full" style="display: none;"> Time-resolved photoemission with ultrafast pump and probe pulses is an emerging technique with wide application potential. Real-time recording of non-equilibrium electronic processes, transient states in chemical reactions or the interplay of electronic and structural dynamics offers fascinating opportunities for future research. Combining valence-band and core-level spectroscopy with photoelectron diffraction for electronic, chemical and structural analysis requires few 10 fs soft X-ray pulses with some 10 meV spectral resolution, which are currently available at high repetition rate free-electron lasers. The PG2 beamline at FLASH (DESY, Hamburg) provides a high pulse rate of 5000 pulses/s, 60 fs pulse duration and 40 meV bandwidth in an energy range of 25-830 eV with a photon beam size down to 50 microns in diameter. We have constructed and optimized a versatile setup commissioned at FLASH/PG2 that combines FEL capabilities together with a multidimensional recording scheme for photoemission studies. We use a full-field imaging momentum microscope with time-of-flight energy recording as the detector for mapping of 3D band structures in ($k_x$, $k_y$, $E$) parameter space with unprecedented efficiency. Our instrument can image full surface Brillouin zones with up to 7 脜 $^{-1}$ diameter in a binding-energy range of several eV, resolving about $2.5\times10^5$ data voxels. As an example, we present results for the ultrafast excited state dynamics in the model van der Waals semiconductor WSe$_2$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.12155v3-abstract-full').style.display = 'none'; document.getElementById('1906.12155v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Review of Scientific Instruments 91, 013109 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1904.00877">arXiv:1904.00877</a> <span> [<a href="https://arxiv.org/pdf/1904.00877">pdf</a>, <a href="https://arxiv.org/ps/1904.00877">ps</a>, <a href="https://arxiv.org/format/1904.00877">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.100.024426">10.1103/PhysRevB.100.024426 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> X-ray spectroscopy of current-induced spin-orbit torques and spin accumulation in Pt/3d transition metal bilayers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Stamm%2C+C">C. Stamm</a>, <a href="/search/?searchtype=author&query=Murer%2C+C">C. Murer</a>, <a href="/search/?searchtype=author&query=Acremann%2C+Y">Y. Acremann</a>, <a href="/search/?searchtype=author&query=Baumgartner%2C+M">M. Baumgartner</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/?searchtype=author&query=D%C3%A4ster%2C+S">S. D盲ster</a>, <a href="/search/?searchtype=author&query=Kleibert%2C+A">A. Kleibert</a>, <a href="/search/?searchtype=author&query=Garello%2C+K">K. Garello</a>, <a href="/search/?searchtype=author&query=Feng%2C+J">J. Feng</a>, <a href="/search/?searchtype=author&query=Gabureac%2C+M">M. Gabureac</a>, <a href="/search/?searchtype=author&query=Chen%2C+Z">Z. Chen</a>, <a href="/search/?searchtype=author&query=St%C3%B6hr%2C+J">J. St枚hr</a>, <a href="/search/?searchtype=author&query=Gambardella%2C+P">P. Gambardella</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1904.00877v2-abstract-short" style="display: inline;"> An electric current flowing in Pt, a material with strong spin-orbit coupling, leads to spins accumulating at the interfaces by virtue of the spin Hall effect and interfacial charge-spin conversion. We measure the influence of these interfacial magnetic moments onto adjacent 3d transition metal layers by x-ray absorption spectroscopy and x-ray magnetic circular dichroism in a quantitative and elem… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.00877v2-abstract-full').style.display = 'inline'; document.getElementById('1904.00877v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1904.00877v2-abstract-full" style="display: none;"> An electric current flowing in Pt, a material with strong spin-orbit coupling, leads to spins accumulating at the interfaces by virtue of the spin Hall effect and interfacial charge-spin conversion. We measure the influence of these interfacial magnetic moments onto adjacent 3d transition metal layers by x-ray absorption spectroscopy and x-ray magnetic circular dichroism in a quantitative and element-selective way, with sensitivity below $10^{-5}~渭_B$ per atom. In Pt(6 nm)/Co(2.5 nm), the accumulated spins cause a deviation of the Co magnetization direction, which corresponds to an effective spin-Hall angle of 0.08. The spin and orbital magnetic moments of Co are affected in equal proportion by the absorption of the spin current, showing that the transfer of orbital momentum from the recently predicted orbital Hall effect is either below our detection limit, or not directed to the 3d states of Co. For Pt/NM (NM = Ti, Cr, Cu), we find upper limits for the amount of injected spins corresponding to about $3\times 10^{-6}~渭_B$ per atom. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.00877v2-abstract-full').style.display = 'none'; document.getElementById('1904.00877v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 100, 024426 (2019) </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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