Thresholding of the Elliott-Yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies

How different microscopic mechanisms of ultrafast spin dynamics coexist and interplay is not only relevant for the development of spintronics but also for the thorough description of physical systems out-of-equilibrium. In pure crystalline ferromagnets, one of the main microscopic mechanism of spin...

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Autores principales: Born, Artur, Decker, Régis, Büchner, Robby, Haverkamp, Robert, Ruotsalainen, Kari, Bauer, Karl, Pietzsch, Annette, Föhlisch, Alexander
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7820427/
https://www.ncbi.nlm.nih.gov/pubmed/33479313
http://dx.doi.org/10.1038/s41598-021-81177-9
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author Born, Artur
Decker, Régis
Büchner, Robby
Haverkamp, Robert
Ruotsalainen, Kari
Bauer, Karl
Pietzsch, Annette
Föhlisch, Alexander
author_facet Born, Artur
Decker, Régis
Büchner, Robby
Haverkamp, Robert
Ruotsalainen, Kari
Bauer, Karl
Pietzsch, Annette
Föhlisch, Alexander
author_sort Born, Artur
collection PubMed
description How different microscopic mechanisms of ultrafast spin dynamics coexist and interplay is not only relevant for the development of spintronics but also for the thorough description of physical systems out-of-equilibrium. In pure crystalline ferromagnets, one of the main microscopic mechanism of spin relaxation is the electron-phonon (el-ph) driven spin-flip, or Elliott-Yafet, scattering. Unexpectedly, recent experiments with ferro- and ferrimagnetic alloys have shown different dynamics for the different sublattices. These distinct sublattice dynamics are contradictory to the Elliott-Yafet scenario. In order to rationalize this discrepancy, it has been proposed that the intra- and intersublattice exchange interaction energies must be considered in the microscopic demagnetization mechanism, too. Here, using a temperature-dependent x-ray emission spectroscopy (XES) method, we address experimentally the element specific el-ph angular momentum transfer rates, responsible for the spin-flips in the respective (sub)lattices of Fe[Formula: see text] Ni[Formula: see text] , Fe[Formula: see text] Ni[Formula: see text] and pure nickel single crystals. We establish how the deduced rate evolution with the temperature is linked to the exchange coupling constants reported for different alloy stoichiometries and how sublattice exchange energies threshold the related el-ph spin-flip channels. Thus, these results evidence that the Elliott-Yafet spin-flip scattering, thresholded by sublattice exchange energies, is the relevant microscopic process to describe sublattice dynamics in alloys and elemental magnetic systems.
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spelling pubmed-78204272021-01-22 Thresholding of the Elliott-Yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies Born, Artur Decker, Régis Büchner, Robby Haverkamp, Robert Ruotsalainen, Kari Bauer, Karl Pietzsch, Annette Föhlisch, Alexander Sci Rep Article How different microscopic mechanisms of ultrafast spin dynamics coexist and interplay is not only relevant for the development of spintronics but also for the thorough description of physical systems out-of-equilibrium. In pure crystalline ferromagnets, one of the main microscopic mechanism of spin relaxation is the electron-phonon (el-ph) driven spin-flip, or Elliott-Yafet, scattering. Unexpectedly, recent experiments with ferro- and ferrimagnetic alloys have shown different dynamics for the different sublattices. These distinct sublattice dynamics are contradictory to the Elliott-Yafet scenario. In order to rationalize this discrepancy, it has been proposed that the intra- and intersublattice exchange interaction energies must be considered in the microscopic demagnetization mechanism, too. Here, using a temperature-dependent x-ray emission spectroscopy (XES) method, we address experimentally the element specific el-ph angular momentum transfer rates, responsible for the spin-flips in the respective (sub)lattices of Fe[Formula: see text] Ni[Formula: see text] , Fe[Formula: see text] Ni[Formula: see text] and pure nickel single crystals. We establish how the deduced rate evolution with the temperature is linked to the exchange coupling constants reported for different alloy stoichiometries and how sublattice exchange energies threshold the related el-ph spin-flip channels. Thus, these results evidence that the Elliott-Yafet spin-flip scattering, thresholded by sublattice exchange energies, is the relevant microscopic process to describe sublattice dynamics in alloys and elemental magnetic systems. Nature Publishing Group UK 2021-01-21 /pmc/articles/PMC7820427/ /pubmed/33479313 http://dx.doi.org/10.1038/s41598-021-81177-9 Text en © The Author(s) 2021 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Born, Artur
Decker, Régis
Büchner, Robby
Haverkamp, Robert
Ruotsalainen, Kari
Bauer, Karl
Pietzsch, Annette
Föhlisch, Alexander
Thresholding of the Elliott-Yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies
title Thresholding of the Elliott-Yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies
title_full Thresholding of the Elliott-Yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies
title_fullStr Thresholding of the Elliott-Yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies
title_full_unstemmed Thresholding of the Elliott-Yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies
title_short Thresholding of the Elliott-Yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies
title_sort thresholding of the elliott-yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7820427/
https://www.ncbi.nlm.nih.gov/pubmed/33479313
http://dx.doi.org/10.1038/s41598-021-81177-9
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