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href="/search/advanced?terms-0-term=Halt%C3%A9%2C+V&terms-0-field=author&size=50&order=-announced_date_first">Advanced Search</a> </div> </div> <input type="hidden" name="order" value="-announced_date_first"> <input type="hidden" name="size" value="50"> </form> <div class="level breathe-horizontal"> <div class="level-left"> <form method="GET" action="/search/"> <div style="display: none;"> <select id="searchtype" name="searchtype"><option value="all">All fields</option><option value="title">Title</option><option selected value="author">Author(s)</option><option value="abstract">Abstract</option><option value="comments">Comments</option><option value="journal_ref">Journal reference</option><option value="acm_class">ACM classification</option><option value="msc_class">MSC classification</option><option value="report_num">Report number</option><option value="paper_id">arXiv identifier</option><option value="doi">DOI</option><option value="orcid">ORCID</option><option 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name="order"><option selected value="-announced_date_first">Announcement date (newest first)</option><option value="announced_date_first">Announcement date (oldest first)</option><option value="-submitted_date">Submission date (newest first)</option><option value="submitted_date">Submission date (oldest first)</option><option value="">Relevance</option></select> </span> </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/2303.15837">arXiv:2303.15837</a> <span> [<a href="https://arxiv.org/pdf/2303.15837">pdf</a>, <a href="https://arxiv.org/format/2303.15837">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"> Role of intersublattice exchange interaction on ultrafast longitudinal and transverse magnetization dynamics in Permalloy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Maghraoui%2C+A">A. Maghraoui</a>, <a href="/search/cond-mat?searchtype=author&query=Fras%2C+F">F. Fras</a>, <a href="/search/cond-mat?searchtype=author&query=Vomir%2C+M">M. Vomir</a>, <a href="/search/cond-mat?searchtype=author&query=Brelet%2C+Y">Y. Brelet</a>, <a href="/search/cond-mat?searchtype=author&query=Halt%C3%A9%2C+V">V. Halt茅</a>, <a href="/search/cond-mat?searchtype=author&query=Bigot%2C+J+Y">J. Y. Bigot</a>, <a href="/search/cond-mat?searchtype=author&query=Barthelemy%2C+M">M. Barthelemy</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="2303.15837v1-abstract-short" style="display: inline;"> We report about element specific measurements of ultrafast demagnetization and magnetization precession damping in Permalloy (Py) thin films. Magnetization dynamics induced by optical pump at $1.5$eV is probed simultaneously at the $M_{2,3}$ edges of Ni and Fe with High order Harmonics for moderate demagnetization rates (less than $50$%). The role of the intersublattice exchange interaction on bot… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.15837v1-abstract-full').style.display = 'inline'; document.getElementById('2303.15837v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.15837v1-abstract-full" style="display: none;"> We report about element specific measurements of ultrafast demagnetization and magnetization precession damping in Permalloy (Py) thin films. Magnetization dynamics induced by optical pump at $1.5$eV is probed simultaneously at the $M_{2,3}$ edges of Ni and Fe with High order Harmonics for moderate demagnetization rates (less than $50$%). The role of the intersublattice exchange interaction on both longitudinal and transverse dynamics is analyzed with a Landau Lifshitz Bloch description of ferromagnetically coupled Fe and Ni sublattices. It is shown that the intersublattice exchange interaction governs the dissipation during demagnetization as well as precession damping of the magnetization vector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.15837v1-abstract-full').style.display = 'none'; document.getElementById('2303.15837v1-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> 28 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </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">8 pages, 5 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/1910.13143">arXiv:1910.13143</a> <span> [<a href="https://arxiv.org/pdf/1910.13143">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"> Laser induced ultrafast 3d and 4f spin dynamics in CoDy ferrimagnetic alloys as a function of temperature </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fert%C3%A9%2C+T">Tom Fert茅</a>, <a href="/search/cond-mat?searchtype=author&query=Malinowski%2C+G">Gr茅gory Malinowski</a>, <a href="/search/cond-mat?searchtype=author&query=Terrier%2C+E">Erwan Terrier</a>, <a href="/search/cond-mat?searchtype=author&query=Halt%C3%A9%2C+V">Val茅rie Halt茅</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=Holldack%2C+K">Karsten Holldack</a>, <a href="/search/cond-mat?searchtype=author&query=Hehn%2C+M">Michel Hehn</a>, <a href="/search/cond-mat?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/cond-mat?searchtype=author&query=Bergeard%2C+N">Nicolas Bergeard</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="1910.13143v2-abstract-short" style="display: inline;"> We report on an element- and time-resolved investigation of femtosecond laser induced ultrafast dynamics of 3d and 4f spins in a ferrimagnetic Co80Dy20 alloy as a function of temperature. We observe an increase of the Co3d characteristic demagnetization time and a decrease of the Dy4f demagnetization time when the temperature is approaching the Curie temperature. It suggests that the critical slow… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.13143v2-abstract-full').style.display = 'inline'; document.getElementById('1910.13143v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.13143v2-abstract-full" style="display: none;"> We report on an element- and time-resolved investigation of femtosecond laser induced ultrafast dynamics of 3d and 4f spins in a ferrimagnetic Co80Dy20 alloy as a function of temperature. We observe an increase of the Co3d characteristic demagnetization time and a decrease of the Dy4f demagnetization time when the temperature is approaching the Curie temperature. It suggests that the critical slowing down regime, which affects the laser induced ultrafast dynamics in pure 3d transition metals and 4f rare-earth ferromagnetic layers, vanishes for the Dy sublattice in the CoDy alloy, in line with the theoretical predictions of the Landau-Lifshitz-Bloch model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.13143v2-abstract-full').style.display = 'none'; document.getElementById('1910.13143v2-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> 15 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </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> 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