Electron-phonon scattering dynamics in ferromagnetic metals and their influence on ultrafast demagnetization processes

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urn:nbn:de:bvb:355-epub-233093 Copy

Essert, Sven ; Schneider, Hans Christian

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Date of publication of this fulltext: 26 Jan 2012 14:19

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Item type:	Article
Journal or Publication Title:	Physical Review B (PRB)
Publisher:	American Physical Society
Volume:	84
Number of Issue or Book Chapter:	22
Page Range:	p. 224405
Date:	9 December 2011
Institutions:	UNSPECIFIED
Interdisciplinary Subject Network:	Not selected
Identification Number:	Value Type 10.1103/PhysRevB.84.224405 DOI
Classification:	Notation Type 75.78.Jp, 75.70.Tj, 78.47.J- PACS
Dewey Decimal Classification:	500 Science > 530 Physics
Status:	Published
Refereed:	Yes, this version has been refereed
Created at the University of Regensburg:	No
Item ID:	23309

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Abstract

We theoretically investigate spin-dependent carrier dynamics due to the electron-phonon interaction after ultrafast optical excitation in ferromagnetic metals. We calculate the electron-phonon matrix elements including the spin-orbit interaction in the electronic wave functions and the interaction potential. Using the matrix elements in Boltzmann scattering integrals, the momentum-resolved ...

Abstract

We theoretically investigate spin-dependent carrier dynamics due to the electron-phonon interaction after ultrafast optical excitation in ferromagnetic metals. We calculate the electron-phonon matrix elements including the spin-orbit interaction in the electronic wave functions and the interaction potential. Using the matrix elements in Boltzmann scattering integrals, the momentum-resolved carrier distributions are obtained by solving their equation of motion numerically. We find that the optical excitation with realistic laser intensities alone leads to a negligible magnetization change, and that the demagnetization due to electron-phonon interaction is mostly due to hole scattering. Importantly, the calculated demagnetization quenching due to this Elliot-Yafet-type depolarization mechanism is not large enough to explain the experimentally observed result. We argue that the ultrafast demagnetization of ferromagnets does not occur exclusively via an Elliott-Yafet type process, i.e., scattering in the presence of the spin-orbit interaction, but is influenced to a large degree by a dynamical change of the band structure, i.e., the exchange splitting.

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Metadata last modified: 11 Feb 2020 09:54

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