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...
Autores principales: | , , , , , , , |
---|---|
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 |
_version_ | 1783639210318626816 |
---|---|
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. |
format | Online Article Text |
id | pubmed-7820427 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT bornartur thresholdingoftheelliottyafetspinflipscatteringinmultisublatticemagnetsbytherespectiveexchangeenergies AT deckerregis thresholdingoftheelliottyafetspinflipscatteringinmultisublatticemagnetsbytherespectiveexchangeenergies AT buchnerrobby thresholdingoftheelliottyafetspinflipscatteringinmultisublatticemagnetsbytherespectiveexchangeenergies AT haverkamprobert thresholdingoftheelliottyafetspinflipscatteringinmultisublatticemagnetsbytherespectiveexchangeenergies AT ruotsalainenkari thresholdingoftheelliottyafetspinflipscatteringinmultisublatticemagnetsbytherespectiveexchangeenergies AT bauerkarl thresholdingoftheelliottyafetspinflipscatteringinmultisublatticemagnetsbytherespectiveexchangeenergies AT pietzschannette thresholdingoftheelliottyafetspinflipscatteringinmultisublatticemagnetsbytherespectiveexchangeenergies AT fohlischalexander thresholdingoftheelliottyafetspinflipscatteringinmultisublatticemagnetsbytherespectiveexchangeenergies |