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

Abstract 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...

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Autores principales:	Artur Born, Régis Decker, Robby Büchner, Robert Haverkamp, Kari Ruotsalainen, Karl Bauer, Annette Pietzsch, Alexander Föhlisch
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2fda8f2414f9491ebd0c5debd8fc31dc
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spelling	oai:doaj.org-article:2fda8f2414f9491ebd0c5debd8fc31dc2021-12-02T10:49:34ZThresholding of the Elliott-Yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies10.1038/s41598-021-81177-92045-2322https://doaj.org/article/2fda8f2414f9491ebd0c5debd8fc31dc2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81177-9https://doaj.org/toc/2045-2322Abstract 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 $$_{20}$$ 20 Ni $$_{80}$$ 80 , Fe $$_{50}$$ 50 Ni $$_{50}$$ 50 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.Artur BornRégis DeckerRobby BüchnerRobert HaverkampKari RuotsalainenKarl BauerAnnette PietzschAlexander FöhlischNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Artur Born Régis Decker Robby Büchner Robert Haverkamp Kari Ruotsalainen Karl Bauer Annette Pietzsch Alexander Föhlisch Thresholding of the Elliott-Yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies
description	Abstract 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 $$_{20}$$ 20 Ni $$_{80}$$ 80 , Fe $$_{50}$$ 50 Ni $$_{50}$$ 50 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	article
author	Artur Born Régis Decker Robby Büchner Robert Haverkamp Kari Ruotsalainen Karl Bauer Annette Pietzsch Alexander Föhlisch
author_facet	Artur Born Régis Decker Robby Büchner Robert Haverkamp Kari Ruotsalainen Karl Bauer Annette Pietzsch Alexander Föhlisch
author_sort	Artur Born
title	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_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_sort	thresholding of the elliott-yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/2fda8f2414f9491ebd0c5debd8fc31dc
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Thresholding of the Elliott-Yafet spin-flip scattering in multi-sublattice magnets by the respective exchange energies

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