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</div> <div class="control"> <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/2210.01702">arXiv:2210.01702</a> <span> [<a href="https://arxiv.org/pdf/2210.01702">pdf</a>, <a href="https://arxiv.org/format/2210.01702">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> <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/10.1103/PhysRevB.106.214434">10.1103/PhysRevB.106.214434 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Enhanced skyrmion metastability under applied strain in FeGe </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Littlehales%2C+M+T">M. T. Littlehales</a>, <a href="/search/cond-mat?searchtype=author&query=Turnbull%2C+L+A">L. A. Turnbull</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+M+N">M. N. Wilson</a>, <a href="/search/cond-mat?searchtype=author&query=Birch%2C+M+T">M. T. Birch</a>, <a href="/search/cond-mat?searchtype=author&query=Popescu%2C+H">H. Popescu</a>, <a href="/search/cond-mat?searchtype=author&query=Jaouen%2C+N">N. Jaouen</a>, <a href="/search/cond-mat?searchtype=author&query=Verezhak%2C+J+A+T">J. A. T. Verezhak</a>, <a href="/search/cond-mat?searchtype=author&query=Balakrishnan%2C+G">G. Balakrishnan</a>, <a href="/search/cond-mat?searchtype=author&query=Hatton%2C+P+D">P. D. Hatton</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="2210.01702v1-abstract-short" style="display: inline;"> Mechanical straining of skyrmion hosting materials has previously demonstrated increased phase stability through the expansion of the skyrmion equilibrium pocket. Additionally, metastable skyrmions can be generated via rapid field-cooling to form significant skyrmion populations at low temperatures. Using small-angle x-ray scattering and x-ray holographic imaging on a thermally strained 200 nm thi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.01702v1-abstract-full').style.display = 'inline'; document.getElementById('2210.01702v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.01702v1-abstract-full" style="display: none;"> Mechanical straining of skyrmion hosting materials has previously demonstrated increased phase stability through the expansion of the skyrmion equilibrium pocket. Additionally, metastable skyrmions can be generated via rapid field-cooling to form significant skyrmion populations at low temperatures. Using small-angle x-ray scattering and x-ray holographic imaging on a thermally strained 200 nm thick FeGe lamella, we observe temperature-induced strain effects on the structure and metastability of the skyrmion lattice. We find that in this sample orientation (H || [1 1 0]) with no strain, metastable skyrmions produced by field cooling through the equilibrium skyrmion pocket vanish from the sample upon dropping below the well known helical reorientation temperature. However, when strain is applied along [110] axis, and this procedure is repeated, a substantial volume fraction of metastable skyrmions persist upon cooling below this temperature down to 100 K. Additionally, we observe a large number of skyrmions retained after a complete magnetic field polarity reversal, implying that the metastable energy barrier protecting skyrmions from decay is enhanced. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.01702v1-abstract-full').style.display = 'none'; document.getElementById('2210.01702v1-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 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.09484">arXiv:2110.09484</a> <span> [<a href="https://arxiv.org/pdf/2110.09484">pdf</a>, <a href="https://arxiv.org/format/2110.09484">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.106.064422">10.1103/PhysRevB.106.064422 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> X-ray holographic imaging of magnetic surface spirals in FeGe lamellae </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Turnbull%2C+L+A">L. A. Turnbull</a>, <a href="/search/cond-mat?searchtype=author&query=Littlehales%2C+M+T">M. T. Littlehales</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+M+N">M. N. Wilson</a>, <a href="/search/cond-mat?searchtype=author&query=Birch%2C+M+T">M. T. Birch</a>, <a href="/search/cond-mat?searchtype=author&query=Popescu%2C+H">H. Popescu</a>, <a href="/search/cond-mat?searchtype=author&query=Jaouen%2C+N">N. Jaouen</a>, <a href="/search/cond-mat?searchtype=author&query=Verezhak%2C+J+A+T">J. A. T. Verezhak</a>, <a href="/search/cond-mat?searchtype=author&query=Balakrishnan%2C+G">G. Balakrishnan</a>, <a href="/search/cond-mat?searchtype=author&query=Hatton%2C+P+D">P. D. Hatton</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="2110.09484v2-abstract-short" style="display: inline;"> Isotropic helimagnets are known to host a diverse range of chiral magnetic states. In 2016, F.N. Rybakov et al. theorized the presence of a surface-pinned stacked spin spiral phase [F.N. Rybakov et al., 2016 New J. Phys. 18 045002], which has yet to be observed experimentally. Here we present experimental evidence for the observation of this state in lamellae of FeGe using resonant x-ray holograph… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.09484v2-abstract-full').style.display = 'inline'; document.getElementById('2110.09484v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.09484v2-abstract-full" style="display: none;"> Isotropic helimagnets are known to host a diverse range of chiral magnetic states. In 2016, F.N. Rybakov et al. theorized the presence of a surface-pinned stacked spin spiral phase [F.N. Rybakov et al., 2016 New J. Phys. 18 045002], which has yet to be observed experimentally. Here we present experimental evidence for the observation of this state in lamellae of FeGe using resonant x-ray holographic imaging data and micromagnetic simulations. The identification of this state has significant implications for the stability of other coexisting spin textures, and will help complete our understanding of helimagnetic systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.09484v2-abstract-full').style.display = 'none'; document.getElementById('2110.09484v2-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 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 106, 064422 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.15020">arXiv:2109.15020</a> <span> [<a href="https://arxiv.org/pdf/2109.15020">pdf</a>, <a href="https://arxiv.org/format/2109.15020">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> <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="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> Simulating magnetic antiskyrmions on the lattice </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Criado%2C+J+C">Juan C. Criado</a>, <a href="/search/cond-mat?searchtype=author&query=Hatton%2C+P+D">Peter D. Hatton</a>, <a href="/search/cond-mat?searchtype=author&query=Schenk%2C+S">Sebastian Schenk</a>, <a href="/search/cond-mat?searchtype=author&query=Spannowsky%2C+M">Michael Spannowsky</a>, <a href="/search/cond-mat?searchtype=author&query=Turnbull%2C+L+A">Luke A. Turnbull</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="2109.15020v1-abstract-short" style="display: inline;"> Magnetic skyrmions are topologically protected spin structures that naturally emerge in magnetic materials. While a vast amount of effort has gone into the study of their properties, their counterpart of opposite topological charge, the antiskyrmion, has not received as much attention. We aim to close this gap by deploying Monte Carlo simulations of spin-lattice systems in order to investigate whi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.15020v1-abstract-full').style.display = 'inline'; document.getElementById('2109.15020v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.15020v1-abstract-full" style="display: none;"> Magnetic skyrmions are topologically protected spin structures that naturally emerge in magnetic materials. While a vast amount of effort has gone into the study of their properties, their counterpart of opposite topological charge, the antiskyrmion, has not received as much attention. We aim to close this gap by deploying Monte Carlo simulations of spin-lattice systems in order to investigate which interactions support antiskyrmions, as well as skyrmions of Bloch and N茅el type. We find that a suitable combination of ferromagnetic exchange and Dzyaloshinskii-Moriya (DM) interactions is able to stabilize all three types. Considering a three-dimensional spin lattice model, we provide a finite-temperature phase diagram featuring a stable antiskyrmion lattice phase for a large range of temperatures. In addition, we also shed light on the creation and annihilation processes of these antiskyrmion tubes and study the effects of the DM interaction strength on their typical size. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.15020v1-abstract-full').style.display = 'none'; document.getElementById('2109.15020v1-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 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">12 pages, 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> IPPP/21/34 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.10108">arXiv:1910.10108</a> <span>  </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> <p class="title is-5 mathjax"> X-Ray Imaging of Mixed States of Skyrmions and Helices in FeGe </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+M+N">M. N. Wilson</a>, <a href="/search/cond-mat?searchtype=author&query=Turnbull%2C+L+A">L. A. Turnbull</a>, <a href="/search/cond-mat?searchtype=author&query=Gross%2C+F">F. Gross</a>, <a href="/search/cond-mat?searchtype=author&query=Birch%2C+M+T">M. T. Birch</a>, <a href="/search/cond-mat?searchtype=author&query=Verezhak%2C+J+A+T">J. A. T. Verezhak</a>, <a href="/search/cond-mat?searchtype=author&query=Twitchett-Harrison%2C+A+C">A. C. Twitchett-Harrison</a>, <a href="/search/cond-mat?searchtype=author&query=Trager%2C+N">N. Trager</a>, <a href="/search/cond-mat?searchtype=author&query=Weigand%2C+M">M. Weigand</a>, <a href="/search/cond-mat?searchtype=author&query=Schutz%2C+G">G. Schutz</a>, <a href="/search/cond-mat?searchtype=author&query=Grafe%2C+J">J. Grafe</a>, <a href="/search/cond-mat?searchtype=author&query=Hatton%2C+P+D">P. D. Hatton</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="1910.10108v2-abstract-short" style="display: inline;"> We report scanning transmission X-ray microscopy of mixed helical and skyrmion magnetic states in thin FeGe lamellae. This imaging of the out-of-plane magnetism allows clear identification of the different magnetic states, and reveals details about the coexistence of helical and skyrmion states. In particular, our data show that finite length helices are continuously deformable down to the size of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.10108v2-abstract-full').style.display = 'inline'; document.getElementById('1910.10108v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.10108v2-abstract-full" style="display: none;"> We report scanning transmission X-ray microscopy of mixed helical and skyrmion magnetic states in thin FeGe lamellae. This imaging of the out-of-plane magnetism allows clear identification of the different magnetic states, and reveals details about the coexistence of helical and skyrmion states. In particular, our data show that finite length helices are continuously deformable down to the size of individual skyrmions and are hence topologically equivalent to skyrmions. Furthermore, we observe transition states between helical and skyrmion states across the thickness of the lamella that are evidence for frozen Bloch points in the sample after field cooling. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.10108v2-abstract-full').style.display = 'none'; document.getElementById('1910.10108v2-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> 26 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </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">Further analysis by the authors suggests that the evidence we presented for the zipping transition between skyrmions and helices was flawed. This mistaken interpretation resulted from slight misalignment between positive and negative circularly polarized images used to produce the XMCD STXM images</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.04528">arXiv:1909.04528</a> <span> [<a href="https://arxiv.org/pdf/1909.04528">pdf</a>, <a href="https://arxiv.org/format/1909.04528">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/10.1038/s41467-020-15474-8">10.1038/s41467-020-15474-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Real-space imaging of confined magnetic skyrmion tubes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Birch%2C+M+T">M. T. Birch</a>, <a href="/search/cond-mat?searchtype=author&query=Cort%C3%A9s-Ortu%C3%B1o%2C+D">D. Cort茅s-Ortu帽o</a>, <a href="/search/cond-mat?searchtype=author&query=Turnbull%2C+L+A">L. A. Turnbull</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+M+N">M. N. Wilson</a>, <a href="/search/cond-mat?searchtype=author&query=Gro%C3%9F%2C+F">F. Gro脽</a>, <a href="/search/cond-mat?searchtype=author&query=Tr%C3%A4ger%2C+N">N. Tr盲ger</a>, <a href="/search/cond-mat?searchtype=author&query=Laurenson%2C+A">A. Laurenson</a>, <a href="/search/cond-mat?searchtype=author&query=Bukin%2C+N">N. Bukin</a>, <a href="/search/cond-mat?searchtype=author&query=Moody%2C+S+H">S. H. Moody</a>, <a href="/search/cond-mat?searchtype=author&query=Weigand%2C+M">M. Weigand</a>, <a href="/search/cond-mat?searchtype=author&query=Sch%C3%BCtz%2C+G">G. Sch眉tz</a>, <a href="/search/cond-mat?searchtype=author&query=Popescu%2C+H">H. Popescu</a>, <a href="/search/cond-mat?searchtype=author&query=Fan%2C+R">R. Fan</a>, <a href="/search/cond-mat?searchtype=author&query=Steadman%2C+P">P. Steadman</a>, <a href="/search/cond-mat?searchtype=author&query=Verezhak%2C+J+A+T">J. A. T. Verezhak</a>, <a href="/search/cond-mat?searchtype=author&query=Balakrishnan%2C+G">G. Balakrishnan</a>, <a href="/search/cond-mat?searchtype=author&query=Loudon%2C+J+C">J. C. Loudon</a>, <a href="/search/cond-mat?searchtype=author&query=Twitchett-Harrison%2C+A+C">A. C. Twitchett-Harrison</a>, <a href="/search/cond-mat?searchtype=author&query=Hovorka%2C+O">O. Hovorka</a>, <a href="/search/cond-mat?searchtype=author&query=Fangohr%2C+H">H. Fangohr</a>, <a href="/search/cond-mat?searchtype=author&query=Ogrin%2C+F">F. Ogrin</a>, <a href="/search/cond-mat?searchtype=author&query=Gr%C3%A4fe%2C+J">J. Gr盲fe</a>, <a href="/search/cond-mat?searchtype=author&query=Hatton%2C+P+D">P. D. Hatton</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="1909.04528v2-abstract-short" style="display: inline;"> Magnetic skyrmions are topologically nontrivial particles with a potential application as information elements in future spintronic device architectures. While they are commonly portrayed as two dimensional objects, in reality magnetic skyrmions are thought to exist as elongated, tube-like objects extending through the thickness of the sample. Study of this skyrmion tube (SkT) state is highly rele… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.04528v2-abstract-full').style.display = 'inline'; document.getElementById('1909.04528v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.04528v2-abstract-full" style="display: none;"> Magnetic skyrmions are topologically nontrivial particles with a potential application as information elements in future spintronic device architectures. While they are commonly portrayed as two dimensional objects, in reality magnetic skyrmions are thought to exist as elongated, tube-like objects extending through the thickness of the sample. Study of this skyrmion tube (SkT) state is highly relevant for investigating skyrmion metastability and for implementation in recently proposed magnonic computing. However, direct experimental imaging of skyrmion tubes has yet to be reported. Here, we demonstrate the first real-space observation of skyrmion tubes in a lamella of FeGe using resonant magnetic x-ray imaging and comparative micromagnetic simulations, confirming their extended structure. The formation of these structures at the edge of the sample highlights the importance of confinement and edge effects in the stabilisation of the SkT state, opening the door to further investigations into this unexplored dimension of the skyrmion spin texture. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.04528v2-abstract-full').style.display = 'none'; document.getElementById('1909.04528v2-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> 11 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications 11, 1726 (2020) </p> </li> </ol> <div 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