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Effect of magnetic anisotropy relaxation on laser-induced magnetization precession in thin galfenol films

Gerevenkov, P. I.; Kuntu, D. V.; Filatov, Ia. A.; Shelukhin, L. A.; Wang, M.; Pattnaik, D. P.; Rushforth, A. W.; Kalashnikova, A. M.; Khokhlov, N. E.

Effect of magnetic anisotropy relaxation on laser-induced magnetization precession in thin galfenol films Thumbnail


Authors

P. I. Gerevenkov

D. V. Kuntu

Ia. A. Filatov

L. A. Shelukhin

M. Wang

D. P. Pattnaik

A. M. Kalashnikova

N. E. Khokhlov



Abstract

The rate and pathways of relaxation of a magnetic medium to its equilibrium following excitation with intense and short laser pulses are the key ingredients of ultrafast optical control of spins. Here we study experimentally the evolution of the magnetization and magnetic anisotropy of thin films of a ferromagnetic metal galfenol (Fe0.81Ga0.19) resulting from excitation with a femtosecond laser pulse. From the temporal evolution of the hysteresis loops we deduce that the magnetization MS and magnetic anisotropy parameters K recover within a nanosecond, and the ratio between K and MS satisfies the thermal equilibrium's power law in the whole time range spanning from a few picoseconds to 3 nanoseconds. We further use the experimentally obtained relaxation times of MS and K to analyze the laser-induced precession and demonstrate how they contribute to its frequency evolution at the nanosecond timescale.

Journal Article Type Article
Acceptance Date Sep 8, 2021
Online Publication Date Sep 20, 2021
Publication Date Sep 20, 2021
Deposit Date Oct 15, 2021
Publicly Available Date Oct 22, 2021
Journal Physical Review Materials
Electronic ISSN 2475-9953
Publisher American Physical Society (APS)
Peer Reviewed Peer Reviewed
Volume 5
Issue 9
Article Number 094407
DOI https://doi.org/10.1103/PhysRevMaterials.5.094407
Keywords Physics and Astronomy (miscellaneous); General Materials Science
Public URL https://nottingham-repository.worktribe.com/output/6460680
Publisher URL https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.5.094407
Additional Information ©2021 American Physical Society

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