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Spectrum evolution and chirping of laser-induced spin wave packets in thin iron films

Filatov, Ia. A.; Gerevenkov, P. I.; Wang, M.; Rushforth, A. W.; Kalashnikova, A. M.; Khokhlov, N. E.

Spectrum evolution and chirping of laser-induced spin wave packets in thin iron films Thumbnail


Authors

Ia. A. Filatov

P. I. Gerevenkov

M. Wang

A. M. Kalashnikova

N. E. Khokhlov



Abstract

We present an experimental study of ultrafast optical excitation of magnetostatic surface spin wave (MSSW) packets and their spectral properties in thin films of pure iron. As the packets leave the excitation area and propagate in space, their spectra evolve non-trivially. Particularly, low or high frequency components are suppressed at the border of the excitation area depending on the orientation of the external magnetic field with respect to the magnetocrystalline anisotropy axes of the film. The effect is ascribed to the ultrafast local heating of the film. Furthermore, the time resolution of the implemented all-optical technique allows us to extract the chirp of the MSSW packet in the time domain via wavelet analysis. The chirp is a result of the group velocity dispersion of the MSSW and, thus, is controlled by the film's magnetic parameters, magnetization and anisotropy, and external field orientation. The demonstrated tunable modulation of MSSW wave packets with femtosecond laser pulses may find application in future magnonic-photonic hybrid devices for wave-based data processing.

Journal Article Type Article
Acceptance Date Feb 25, 2022
Online Publication Date Mar 16, 2022
Publication Date Mar 14, 2022
Deposit Date Mar 18, 2022
Publicly Available Date Mar 18, 2022
Journal Applied Physics Letters
Print ISSN 0003-6951
Electronic ISSN 1077-3118
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 120
Issue 11
Article Number 112404
DOI https://doi.org/10.1063/5.0077195
Keywords Physics and Astronomy (miscellaneous)
Public URL https://nottingham-repository.worktribe.com/output/7610425
Publisher URL https://aip.scitation.org/doi/10.1063/5.0077195
Additional Information This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in (citation of published article) and may be found at https://aip.scitation.org/doi/10.1063/5.0077195

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