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Optical Excitation of Propagating Magnetostatic Waves in an Epitaxial Galfenol Film by Ultrafast Magnetic Anisotropy Change

Khokhlov, N. E.; Gerevenkov, P. I.; Shelukhin, L. A.; Azovtsev, A. V.; Pertsev, N. A.; Wang, M.; Rushforth, A. W.; Scherbakov, A. V.; Kalashnikova, A. M.


N. E. Khokhlov

P. I. Gerevenkov

L. A. Shelukhin

A. V. Azovtsev

N. A. Pertsev

M. Wang

A. V. Scherbakov

A. M. Kalashnikova


© 2019 American Physical Society. Using a time-resolved optically pumped scanning-optical-microscopy technique, we demonstrate the laser-driven excitation and propagation of spin waves in a 20-nm film of a ferromagnetic metallic alloy Galfenol epitaxially grown on a GaAs substrate. In contrast to previous all-optical studies of spin waves, we employ laser-induced thermal changes of magnetocrystalline anisotropy as an excitation mechanism. A tightly focused 70-fs laser pulse excites packets of magnetostatic surface waves with an e-1-propagation length of 3.4μm, which is comparable with that of permalloy. As a result, laser-driven magnetostatic spin waves are clearly detectable at distances in excess of 10μm, which promotes epitaxial Galfenol films to the limited family of materials suitable for magnonic devices. A pronounced in-plane magnetocrystalline anisotropy of the Galfenol film offers an additional degree of freedom for manipulating the spin waves' parameters. Reorientation of an in-plane external magnetic field relative to the crystallographic axes of the sample tunes the frequency, amplitude, and propagation length of the excited waves.


Khokhlov, N. E., Gerevenkov, P. I., Shelukhin, L. A., Azovtsev, A. V., Pertsev, N. A., Wang, M., …Kalashnikova, A. M. (2019). Optical Excitation of Propagating Magnetostatic Waves in an Epitaxial Galfenol Film by Ultrafast Magnetic Anisotropy Change. Physical Review Applied, 12(4), Article 044044.

Journal Article Type Article
Acceptance Date Sep 5, 2019
Online Publication Date Oct 18, 2019
Publication Date Oct 18, 2019
Deposit Date Oct 28, 2019
Publicly Available Date Oct 29, 2019
Journal Physical Review Applied
Electronic ISSN 2331-7019
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 12
Issue 4
Article Number 044044
Public URL
Publisher URL
Additional Information ©2019 American Physical Society


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