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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li 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/cond-mat?searchtype=author&query=Lojewski%2C+T">Tobias Lojewski</a>, <a href="/search/cond-mat?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/cond-mat?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/cond-mat?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/cond-mat?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/cond-mat?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/cond-mat?searchtype=author&query=Deiter%2C+C">Carsten Deiter</a>, <a href="/search/cond-mat?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/cond-mat?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/cond-mat?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/cond-mat?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/cond-mat?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/cond-mat?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/cond-mat?searchtype=author&query=de+Groot%2C+F">Frank de Groot</a>, <a href="/search/cond-mat?searchtype=author&query=Hansen%2C+K">Karsten Hansen</a>, <a href="/search/cond-mat?searchtype=author&query=Hauf%2C+S">Steffen Hauf</a>, <a href="/search/cond-mat?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/cond-mat?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/cond-mat?searchtype=author&query=K%C3%A4mmerer%2C+L">Lea K盲mmerer</a>, <a href="/search/cond-mat?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/cond-mat?searchtype=author&query=Lomidze%2C+D">David Lomidze</a>, <a href="/search/cond-mat?searchtype=author&query=Maffessanti%2C+S">Stefano Maffessanti</a>, <a href="/search/cond-mat?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/cond-mat?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/cond-mat?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/2211.17008">arXiv:2211.17008</a> <span> [<a href="https://arxiv.org/pdf/2211.17008">pdf</a>, <a href="https://arxiv.org/format/2211.17008">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/10.1063/4.0000206">10.1063/4.0000206 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electron Dynamics at High-Energy Densities in Nickel from Non-linear Resonant X-ray Absorption Spectra </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/cond-mat?searchtype=author&query=Alexander%2C+O">Oliver Alexander</a>, <a href="/search/cond-mat?searchtype=author&query=Atak%2C+K">Kaan Atak</a>, <a href="/search/cond-mat?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</a>, <a href="/search/cond-mat?searchtype=author&query=Buck%2C+J">Jens Buck</a>, <a href="/search/cond-mat?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/cond-mat?searchtype=author&query=Cascella%2C+M">Michele Cascella</a>, <a href="/search/cond-mat?searchtype=author&query=Chardonnet%2C+V">Valentin Chardonnet</a>, <a href="/search/cond-mat?searchtype=author&query=Chiuzbaian%2C+G+S">Gheorghe Sorin Chiuzbaian</a>, <a href="/search/cond-mat?searchtype=author&query=David%2C+C">Christian David</a>, <a href="/search/cond-mat?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/cond-mat?searchtype=author&query=Eschenlohr%2C+A">Andrea Eschenlohr</a>, <a href="/search/cond-mat?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/cond-mat?searchtype=author&query=de+Groot%2C+F">Frank de Groot</a>, <a href="/search/cond-mat?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/cond-mat?searchtype=author&query=Humphries%2C+O+S">Oliver S. Humphries</a>, <a href="/search/cond-mat?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/cond-mat?searchtype=author&query=Jal%2C+E">Emmanuelle Jal</a>, <a href="/search/cond-mat?searchtype=author&query=Kubec%2C+A">Adam Kubec</a>, <a href="/search/cond-mat?searchtype=author&query=Laarmann%2C+T">Tim Laarmann</a>, <a href="/search/cond-mat?searchtype=author&query=Lambert%2C+C">Charles-Henri Lambert</a>, <a href="/search/cond-mat?searchtype=author&query=L%C3%BCning%2C+J">Jan L眉ning</a>, <a href="/search/cond-mat?searchtype=author&query=Marangos%2C+J+P">Jonathan P. Marangos</a>, <a href="/search/cond-mat?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/cond-mat?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a> , et al. (18 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="2211.17008v1-abstract-short" style="display: inline;"> The pulse intensity from X-ray free-electron lasers (FELs) can create extreme excitation densities in solids, entering the regime of non-linear X-ray-matter interactions. We show L3-edge absorption spectra of metallic nickel thin films with fluences entering a regime where several X-ray photons are incident per absorption cross-section. Main features of the observed non-linear spectral changes are… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.17008v1-abstract-full').style.display = 'inline'; document.getElementById('2211.17008v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.17008v1-abstract-full" style="display: none;"> The pulse intensity from X-ray free-electron lasers (FELs) can create extreme excitation densities in solids, entering the regime of non-linear X-ray-matter interactions. We show L3-edge absorption spectra of metallic nickel thin films with fluences entering a regime where several X-ray photons are incident per absorption cross-section. Main features of the observed non-linear spectral changes are described with a predictive rate model for electron population dynamics during the pulse, utilizing a fixed density of states and tabulated ground-state properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.17008v1-abstract-full').style.display = 'none'; document.getElementById('2211.17008v1-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> 30 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">The main text contains 5 pages and 4 figures, the total length including supplement is 14 pages, 7 figures and one table. See also the simultaneously submitted paper about the rate model</span> </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/cond-mat?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/cond-mat?searchtype=author&query=Eschenlohr%2C+A">Andrea Eschenlohr</a>, <a href="/search/cond-mat?searchtype=author&query=Beye%2C+M">Martin Beye</a>, <a href="/search/cond-mat?searchtype=author&query=Schlotter%2C+W">William Schlotter</a>, <a href="/search/cond-mat?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/cond-mat?searchtype=author&query=Carinan%2C+C">Cammille Carinan</a>, <a href="/search/cond-mat?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/cond-mat?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/cond-mat?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/cond-mat?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</a>, <a href="/search/cond-mat?searchtype=author&query=Buck%2C+J">Jens Buck</a>, <a href="/search/cond-mat?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/cond-mat?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/cond-mat?searchtype=author&query=D%27Elia%2C+A">Alessandro D'Elia</a>, <a href="/search/cond-mat?searchtype=author&query=Delitz%2C+J">Jan-Torben Delitz</a>, <a href="/search/cond-mat?searchtype=author&query=Ehsan%2C+W">Wajid Ehsan</a>, <a href="/search/cond-mat?searchtype=author&query=Engel%2C+R">Robin Engel</a>, <a href="/search/cond-mat?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/cond-mat?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/cond-mat?searchtype=author&query=Fischer%2C+P">Peter Fischer</a>, <a href="/search/cond-mat?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/cond-mat?searchtype=author&query=F%C3%B6hlisch%2C+A">Alexander F枚hlisch</a>, <a href="/search/cond-mat?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/cond-mat?searchtype=author&query=Gensch%2C+M">Michael Gensch</a>, <a href="/search/cond-mat?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/cond-mat?searchtype=author&query=Lojewski%2C+T">Tobias Lojewski</a>, <a href="/search/cond-mat?searchtype=author&query=Elhanoty%2C+M+F">Mohamed F. Elhanoty</a>, <a href="/search/cond-mat?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/cond-mat?searchtype=author&query=Gr%C3%A5n%C3%A4s%2C+O">Oscar Gr氓n盲s</a>, <a href="/search/cond-mat?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/cond-mat?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/cond-mat?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/cond-mat?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/cond-mat?searchtype=author&query=David%2C+C">Christian David</a>, <a href="/search/cond-mat?searchtype=author&query=Deiter%2C+C">Carsten Deiter</a>, <a href="/search/cond-mat?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/cond-mat?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/cond-mat?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/cond-mat?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/cond-mat?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/cond-mat?searchtype=author&query=Fischer%2C+P">Peter Fischer</a>, <a href="/search/cond-mat?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/cond-mat?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/cond-mat?searchtype=author&query=de+Groot%2C+F">Frank de Groot</a>, <a href="/search/cond-mat?searchtype=author&query=Hansen%2C+K">Karsten Hansen</a>, <a href="/search/cond-mat?searchtype=author&query=Hauf%2C+S">Steffen Hauf</a>, <a href="/search/cond-mat?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/cond-mat?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/cond-mat?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/cond-mat?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/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/cond-mat?searchtype=author&query=Stamm%2C+C">C. Stamm</a>, <a href="/search/cond-mat?searchtype=author&query=Murer%2C+C">C. Murer</a>, <a href="/search/cond-mat?searchtype=author&query=W%C3%B6rnle%2C+M+S">M. S. W枚rnle</a>, <a href="/search/cond-mat?searchtype=author&query=Acremann%2C+Y">Y. Acremann</a>, <a href="/search/cond-mat?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/cond-mat?searchtype=author&query=D%C3%A4ster%2C+S">S. D盲ster</a>, <a href="/search/cond-mat?searchtype=author&query=Reid%2C+A+H">A. H. Reid</a>, <a href="/search/cond-mat?searchtype=author&query=Higley%2C+D+J">D. J. Higley</a>, <a href="/search/cond-mat?searchtype=author&query=Wandel%2C+S+F">S. F. Wandel</a>, <a href="/search/cond-mat?searchtype=author&query=Schlotter%2C+W+F">W. F. Schlotter</a>, <a href="/search/cond-mat?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/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/cond-mat?searchtype=author&query=Stamm%2C+C">C. Stamm</a>, <a href="/search/cond-mat?searchtype=author&query=Murer%2C+C">C. Murer</a>, <a href="/search/cond-mat?searchtype=author&query=Acremann%2C+Y">Y. Acremann</a>, <a href="/search/cond-mat?searchtype=author&query=Baumgartner%2C+M">M. Baumgartner</a>, <a href="/search/cond-mat?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/cond-mat?searchtype=author&query=D%C3%A4ster%2C+S">S. D盲ster</a>, <a href="/search/cond-mat?searchtype=author&query=Kleibert%2C+A">A. Kleibert</a>, <a href="/search/cond-mat?searchtype=author&query=Garello%2C+K">K. Garello</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+J">J. Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Gabureac%2C+M">M. Gabureac</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+Z">Z. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=St%C3%B6hr%2C+J">J. St枚hr</a>, <a href="/search/cond-mat?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> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.08243">arXiv:1802.08243</a> <span> [<a href="https://arxiv.org/pdf/1802.08243">pdf</a>, <a href="https://arxiv.org/format/1802.08243">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Magnetic properties of metal-organic coordination networks based on 3d transition metal atoms </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Blanco-Rey%2C+M">Mar铆a Blanco-Rey</a>, <a href="/search/cond-mat?searchtype=author&query=Sarasola%2C+A">Ane Sarasola</a>, <a href="/search/cond-mat?searchtype=author&query=Nistor%2C+C">Corneliu Nistor</a>, <a href="/search/cond-mat?searchtype=author&query=Persichetti%2C+L">Luca Persichetti</a>, <a href="/search/cond-mat?searchtype=author&query=Stamm%2C+C">Christian Stamm</a>, <a href="/search/cond-mat?searchtype=author&query=Piamonteze%2C+C">Cinthia Piamonteze</a>, <a href="/search/cond-mat?searchtype=author&query=Gambardella%2C+P">Pietro Gambardella</a>, <a href="/search/cond-mat?searchtype=author&query=Stepanow%2C+S">Sebastian Stepanow</a>, <a href="/search/cond-mat?searchtype=author&query=Otrokov%2C+M+M">Mikhail M. Otrokov</a>, <a href="/search/cond-mat?searchtype=author&query=Golovach%2C+V+N">Vitaly N. Golovach</a>, <a href="/search/cond-mat?searchtype=author&query=Arnau%2C+A">Andres Arnau</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="1802.08243v1-abstract-short" style="display: inline;"> The magnetic anisotropy and exchange coupling between spins localized at the positions of 3d transition metal atoms forming two-dimensional metal-organic coordination networks (MOCNs) grown on the Au(111) metal surface are studied. In particular, we consider MOCNs made of Ni or Mn metal centers linked by TCNQ (7,7,8,8-tetracyanoquinodimethane) organic ligands, which form rectangular networks with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.08243v1-abstract-full').style.display = 'inline'; document.getElementById('1802.08243v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.08243v1-abstract-full" style="display: none;"> The magnetic anisotropy and exchange coupling between spins localized at the positions of 3d transition metal atoms forming two-dimensional metal-organic coordination networks (MOCNs) grown on the Au(111) metal surface are studied. In particular, we consider MOCNs made of Ni or Mn metal centers linked by TCNQ (7,7,8,8-tetracyanoquinodimethane) organic ligands, which form rectangular networks with 1:1 stoichiometry. Based on the analysis of X-ray magnetic circular dichroism (XMCD) data taken at T= 2.5 K, we find that Ni atoms in the Ni-TCNQ MOCNs are coupled ferromagnetically and do not show any significant magnetic anisotropy, while Mn atoms in the Mn-TCNQ MOCNs are coupled antiferromagnetically and do show a weak magnetic anisotropy with in-planemagnetization. We explain these observations using both amodelHamiltonian based on mean-fieldWeiss theory and density functional theory calculations that include spin-orbit coupling. Our main conclusion is that the antiferromagnetic coupling between Mn spins and the in-plane magnetization of the Mn spins can be explained neglecting effects due to the presence of the Au(111) surface, while for Ni-TCNQ the metal surface plays a role in determining the absence of magnetic anisotropy in the system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.08243v1-abstract-full').style.display = 'none'; document.getElementById('1802.08243v1-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> 22 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </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">17 pages, 7 figures, submitted to Molecules (MDPI) on February 21st 2018, Supplementary Material in submit/2172866</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1704.06714">arXiv:1704.06714</a> <span> [<a href="https://arxiv.org/pdf/1704.06714">pdf</a>, <a href="https://arxiv.org/ps/1704.06714">ps</a>, <a href="https://arxiv.org/format/1704.06714">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/PhysRevLett.119.087203">10.1103/PhysRevLett.119.087203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magneto-Optical Detection of the Spin Hall Effect in Pt and W Thin Films </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Stamm%2C+C">Christian Stamm</a>, <a href="/search/cond-mat?searchtype=author&query=Murer%2C+C">Christoph Murer</a>, <a href="/search/cond-mat?searchtype=author&query=Berritta%2C+M">Marco Berritta</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+J">Junxiao Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Gabureac%2C+M">Mihai Gabureac</a>, <a href="/search/cond-mat?searchtype=author&query=Oppeneer%2C+P+M">Peter M. Oppeneer</a>, <a href="/search/cond-mat?searchtype=author&query=Gambardella%2C+P">Pietro 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="1704.06714v2-abstract-short" style="display: inline;"> Here we report the measurement of the interfacial spin accumulation induced by the spin Hall effect in Pt and W thin films using magneto-optical Kerr microscopy. We show that the Kerr rotation has opposite sign in Pt and W and scales linearly with current density. By comparing the experimental results with ab-initio calculations of the spin Hall and magneto-optical Kerr effects, we quantitatively… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.06714v2-abstract-full').style.display = 'inline'; document.getElementById('1704.06714v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1704.06714v2-abstract-full" style="display: none;"> Here we report the measurement of the interfacial spin accumulation induced by the spin Hall effect in Pt and W thin films using magneto-optical Kerr microscopy. We show that the Kerr rotation has opposite sign in Pt and W and scales linearly with current density. By comparing the experimental results with ab-initio calculations of the spin Hall and magneto-optical Kerr effects, we quantitatively determine the current-induced spin accumulation at the Pt interface as $5*10^{-12} 渭_B$A$^{-1}$cm$^2$ per atom. From thickness-dependent measurements, we determine the spin diffusion length in a single Pt film to be $11 \pm 3$ nm, which is significantly larger compared to that of Pt adjacent to a magnetic layer. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.06714v2-abstract-full').style.display = 'none'; document.getElementById('1704.06714v2-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> 27 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2017. </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 including Supplemental Material</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 119, 087203 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1704.06402">arXiv:1704.06402</a> <span> [<a href="https://arxiv.org/pdf/1704.06402">pdf</a>, <a href="https://arxiv.org/format/1704.06402">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</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/10.1038/nnano.2017.151">10.1038/nnano.2017.151 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Time- and spatially-resolved magnetization dynamics driven by spin-orbit torques </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Baumgartner%2C+M">Manuel Baumgartner</a>, <a href="/search/cond-mat?searchtype=author&query=Garello%2C+K">Kevin Garello</a>, <a href="/search/cond-mat?searchtype=author&query=Mendil%2C+J">Johannes Mendil</a>, <a href="/search/cond-mat?searchtype=author&query=Avci%2C+C+O">Can Onur Avci</a>, <a href="/search/cond-mat?searchtype=author&query=Grimaldi%2C+E">Eva Grimaldi</a>, <a href="/search/cond-mat?searchtype=author&query=Murer%2C+C">Christoph Murer</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+J">Junxiao Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Gabureac%2C+M">Mihai Gabureac</a>, <a href="/search/cond-mat?searchtype=author&query=Stamm%2C+C">Christian Stamm</a>, <a href="/search/cond-mat?searchtype=author&query=Acremann%2C+Y">Yves Acremann</a>, <a href="/search/cond-mat?searchtype=author&query=Finizio%2C+S">Simone Finizio</a>, <a href="/search/cond-mat?searchtype=author&query=Wintz%2C+S">Sebastian Wintz</a>, <a href="/search/cond-mat?searchtype=author&query=Raabe%2C+J">J枚rg Raabe</a>, <a href="/search/cond-mat?searchtype=author&query=Gambardella%2C+P">Pietro 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="1704.06402v1-abstract-short" style="display: inline;"> Current-induced spin-orbit torques (SOTs) represent one of the most effective ways to manipulate the magnetization in spintronic devices. The orthogonal torque-magnetization geometry, the strong damping, and the large domain wall velocities inherent to materials with strong spin-orbit coupling make SOTs especially appealing for fast switching applications in nonvolatile memory and logic units. So… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.06402v1-abstract-full').style.display = 'inline'; document.getElementById('1704.06402v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1704.06402v1-abstract-full" style="display: none;"> Current-induced spin-orbit torques (SOTs) represent one of the most effective ways to manipulate the magnetization in spintronic devices. The orthogonal torque-magnetization geometry, the strong damping, and the large domain wall velocities inherent to materials with strong spin-orbit coupling make SOTs especially appealing for fast switching applications in nonvolatile memory and logic units. So far, however, the timescale and evolution of the magnetization during the switching process have remained undetected. Here, we report the direct observation of SOT-driven magnetization dynamics in Pt/Co/AlO$_x$ dots during current pulse injection. Time-resolved x-ray images with 25 nm spatial and 100 ps temporal resolution reveal that switching is achieved within the duration of a sub-ns current pulse by the fast nucleation of an inverted domain at the edge of the dot and propagation of a tilted domain wall across the dot. The nucleation point is deterministic and alternates between the four dot quadrants depending on the sign of the magnetization, current, and external field. Our measurements reveal how the magnetic symmetry is broken by the concerted action of both damping-like and field-like SOT and show that reproducible switching events can be obtained for over $10^{12}$ reversal cycles. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.06402v1-abstract-full').style.display = 'none'; document.getElementById('1704.06402v1-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 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nat. Nanotech., 12, 980-986 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1301.4885">arXiv:1301.4885</a> <span> [<a href="https://arxiv.org/pdf/1301.4885">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 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.87.214412">10.1103/PhysRevB.87.214412 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Role of critical spin fluctuations in ultrafast demagnetization of transition-metal rare-earth alloys </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lopez-Flores%2C+V">V. Lopez-Flores</a>, <a href="/search/cond-mat?searchtype=author&query=Bergeard%2C+N">N. Bergeard</a>, <a href="/search/cond-mat?searchtype=author&query=Halte%2C+V">V. Halte</a>, <a href="/search/cond-mat?searchtype=author&query=Stamm%2C+C">C Stamm</a>, <a href="/search/cond-mat?searchtype=author&query=Pontius%2C+N">N. Pontius</a>, <a href="/search/cond-mat?searchtype=author&query=Hehn%2C+M">M. Hehn</a>, <a href="/search/cond-mat?searchtype=author&query=Otero%2C+E">E. Otero</a>, <a href="/search/cond-mat?searchtype=author&query=Beaurepaire%2C+E">E. Beaurepaire</a>, <a href="/search/cond-mat?searchtype=author&query=Boeglin%2C+C">C. Boeglin</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="1301.4885v3-abstract-short" style="display: inline;"> Ultrafast magnetization dynamics induced by femtosecond laser pulses have been measured in ferrimagnetic Co0.8Gd0.2, Co.74Tb.26 and Co.86Tb.14 alloys. Using element sensitivity of X-ray magnetic circular dichroism at the Co L3, Tb M5 and Gd M5 edges we evidence that the demagnetization dynamics is element dependent. We show that a thermalization time as fast as 280 fs is observed for the rare-eart… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.4885v3-abstract-full').style.display = 'inline'; document.getElementById('1301.4885v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1301.4885v3-abstract-full" style="display: none;"> Ultrafast magnetization dynamics induced by femtosecond laser pulses have been measured in ferrimagnetic Co0.8Gd0.2, Co.74Tb.26 and Co.86Tb.14 alloys. Using element sensitivity of X-ray magnetic circular dichroism at the Co L3, Tb M5 and Gd M5 edges we evidence that the demagnetization dynamics is element dependent. We show that a thermalization time as fast as 280 fs is observed for the rare-earth in the alloy, when the laser excited state temperature is below the compensation temperature. It is limited to 500 fs when the laser excited state temperature is below the Curie temperature (Tc). We propose critical spin fluctuations in the vicinity of TC as the mechanism which reduces the demagnetization rates of the 4f electrons in transition-metal rare-earth alloys whereas at any different temperature the limited demagnetization rates could be avoided. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.4885v3-abstract-full').style.display = 'none'; document.getElementById('1301.4885v3-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> 7 May, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 January, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2013. </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 pages, 4 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/1011.6538">arXiv:1011.6538</a> <span>  </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"> Hot electron driven enhancement of spin-lattice coupling in 4f ferromagnets observed by femtosecond x-ray magnetic circular dichroism </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wietstruk%2C+M">Marko Wietstruk</a>, <a href="/search/cond-mat?searchtype=author&query=Melnikov%2C+A">Alexey Melnikov</a>, <a href="/search/cond-mat?searchtype=author&query=Stamm%2C+C">Christian Stamm</a>, <a href="/search/cond-mat?searchtype=author&query=Kachel%2C+T">Torsten Kachel</a>, <a href="/search/cond-mat?searchtype=author&query=Pontius%2C+N">Niko Pontius</a>, <a href="/search/cond-mat?searchtype=author&query=Sultan%2C+M">Muhammad Sultan</a>, <a href="/search/cond-mat?searchtype=author&query=Gahl%2C+C">Cornelius Gahl</a>, <a href="/search/cond-mat?searchtype=author&query=Weinelt%2C+M">Martin Weinelt</a>, <a href="/search/cond-mat?searchtype=author&query=D%C3%BCrr%2C+H+A">Hermann A. D眉rr</a>, <a href="/search/cond-mat?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</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="1011.6538v2-abstract-short" style="display: inline;"> Due to an error this article has been annouced as a new article instead of a corrected version of article 1010.1374. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1011.6538v2-abstract-full" style="display: none;"> Due to an error this article has been annouced as a new article instead of a corrected version of article 1010.1374. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1011.6538v2-abstract-full').style.display = 'none'; document.getElementById('1011.6538v2-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> 10 January, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 November, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2010. </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 paper has been withdrawn</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1010.1374">arXiv:1010.1374</a> <span> [<a href="https://arxiv.org/pdf/1010.1374">pdf</a>, <a href="https://arxiv.org/ps/1010.1374">ps</a>, <a href="https://arxiv.org/format/1010.1374">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/PhysRevLett.106.127401">10.1103/PhysRevLett.106.127401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Hot electron driven enhancement of spin-lattice coupling in 4f ferromagnets observed by femtosecond x-ray magnetic circular dichroism </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wietstruk%2C+M">Marko Wietstruk</a>, <a href="/search/cond-mat?searchtype=author&query=Melnikov%2C+A">Alexey Melnikov</a>, <a href="/search/cond-mat?searchtype=author&query=Stamm%2C+C">Christian Stamm</a>, <a href="/search/cond-mat?searchtype=author&query=Kachel%2C+T">Torsten Kachel</a>, <a href="/search/cond-mat?searchtype=author&query=Pontius%2C+N">Niko Pontius</a>, <a href="/search/cond-mat?searchtype=author&query=Sultan%2C+M">Muhammad Sultan</a>, <a href="/search/cond-mat?searchtype=author&query=Gahl%2C+C">Cornelius Gahl</a>, <a href="/search/cond-mat?searchtype=author&query=Weinelt%2C+M">Martin Weinelt</a>, <a href="/search/cond-mat?searchtype=author&query=D%C3%BCrr%2C+H+A">Hermann A. D眉rr</a>, <a href="/search/cond-mat?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</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="1010.1374v2-abstract-short" style="display: inline;"> Femtosecond x-ray magnetic circular dichroism was used to study the time-dependent magnetic moment of 4 fs electrons in the ferromagnets Gd and Tb, which are known for their different spin-lattice coupling. We observe a two-step demagnetization with an ultrafast demagnetization time of 750 fs identical for both systems and slower times which differ sizeably with 40 ps for Gd and 8 ps for Tb. We co… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1010.1374v2-abstract-full').style.display = 'inline'; document.getElementById('1010.1374v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1010.1374v2-abstract-full" style="display: none;"> Femtosecond x-ray magnetic circular dichroism was used to study the time-dependent magnetic moment of 4 fs electrons in the ferromagnets Gd and Tb, which are known for their different spin-lattice coupling. We observe a two-step demagnetization with an ultrafast demagnetization time of 750 fs identical for both systems and slower times which differ sizeably with 40 ps for Gd and 8 ps for Tb. We conclude that spin-lattice coupling in the electronically excited state is enhanced up to orders of magnitude compared to equilibrium. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1010.1374v2-abstract-full').style.display = 'none'; document.getElementById('1010.1374v2-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> 7 January, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 October, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2010. </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">added reference 24, clarified the meaning of photo-induced, emphasized that XMCD probes the magnetic moment localized at 4f electrons</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 106, 127401 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1002.1656">arXiv:1002.1656</a> <span> [<a href="https://arxiv.org/pdf/1002.1656">pdf</a>, <a href="https://arxiv.org/ps/1002.1656">ps</a>, <a href="https://arxiv.org/format/1002.1656">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.81.104425">10.1103/PhysRevB.81.104425 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Femtosecond x-ray absorption spectroscopy of spin and orbital angular momentum in photoexcited Ni films during ultrafast demagnetization </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Stamm%2C+C">C. Stamm</a>, <a href="/search/cond-mat?searchtype=author&query=Pontius%2C+N">N. Pontius</a>, <a href="/search/cond-mat?searchtype=author&query=Kachel%2C+T">T. Kachel</a>, <a href="/search/cond-mat?searchtype=author&query=Wietstruk%2C+M">M. Wietstruk</a>, <a href="/search/cond-mat?searchtype=author&query=D%C3%BCrr%2C+H+A">H. A. D眉rr</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="1002.1656v2-abstract-short" style="display: inline;"> We follow for the first time the evolution of the spin and orbital angular momentum of a thin Ni film during ultrafast demagnetization, by means of x-ray magnetic circular dichroism. Both components decrease with a 130 +/- 40 fs time constant upon excitation with a femtosecond laser pulse. Additional x-ray absorption measurements reveal an increase in the spin-orbit interaction by 6 +/- 2 % during… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.1656v2-abstract-full').style.display = 'inline'; document.getElementById('1002.1656v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1002.1656v2-abstract-full" style="display: none;"> We follow for the first time the evolution of the spin and orbital angular momentum of a thin Ni film during ultrafast demagnetization, by means of x-ray magnetic circular dichroism. Both components decrease with a 130 +/- 40 fs time constant upon excitation with a femtosecond laser pulse. Additional x-ray absorption measurements reveal an increase in the spin-orbit interaction by 6 +/- 2 % during this process. This is the experimental demonstration quantifying the importance of spin-orbit mediated processes during the demagnetization. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.1656v2-abstract-full').style.display = 'none'; document.getElementById('1002.1656v2-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 March, 2010; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 February, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 81, 104425 (2010) </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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