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Optical excitation of single- and multi-mode magnetization precession in Fe-Ga nanolayers

Scherbakov, A.V.; Danilov, A.P.; Godejohann, F.; Linnik, T.L.; Glavin, B.A.; Shelukhin, L. A.; Pattnaik, D.P.; Wang, M.; Rushforth, Andrew; Yakovlev, D.R.; Akimov, A.V.; Bayer, M.

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Authors

A.V. Scherbakov

A.P. Danilov

F. Godejohann

T.L. Linnik

B.A. Glavin

L. A. Shelukhin

D.P. Pattnaik

M. Wang

D.R. Yakovlev

ANDREY AKIMOV ANDREY.AKIMOV@NOTTINGHAM.AC.UK
Principal Research Fellow

M. Bayer



Abstract

We demonstrate a variety of precessional responses of the magnetization to ultrafast optical excitation in nanolayers of Galfenol (Fe,Ga), which is a ferromagnetic material with large saturation magnetization and enhanced magnetostriction. The particular properties of Galfenol, including cubic magnetic anisotropy and weak damping, allow us to detect up to 6 magnon modes in a 120nm layer, and a single mode with effective damping _eff = 0.005 and frequency up to 100 GHz in a 4- nm layer. This is the highest frequency observed to date in time-resolved experiments with metallic ferromagnets. We predict that detection of magnetisation precession approaching THz frequencies should be possible with Galfenol nanolayers.

Journal Article Type Letter
Acceptance Date Feb 9, 2019
Online Publication Date Mar 22, 2019
Publication Date Mar 22, 2019
Deposit Date Mar 13, 2019
Publicly Available Date Mar 14, 2019
Journal Physical Review Applied
Electronic ISSN 2331-7019
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 11
Issue 3
Article Number 031003
DOI https://doi.org/10.1103/PhysRevApplied.11.031003
Public URL https://nottingham-repository.worktribe.com/output/1563019
Publisher URL https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.11.031003

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