Optical excitation of spin waves in epitaxial iron garnet films: MSSW vs BVMSW

Авторы: Chernov A.I., Kozhaev M.A., Savochkin I.V., Dodonov D.V., Vetoshko P.M., Zvezdin A.K., Belotelov V.I.
Журнал: Optics Letters
Том: 42
Номер: 2
Год издания: 2017
Издательство: Optical Society of America
Местоположение издательства: United States
DOI: 10.1364/OL.42.000279
Аннотация: In most of the previous studies of the spin wave optical generation in magnetic dielectrics, the backward volume spin waves were excited. Here we modified the parameters of the circularly polarized optical pump beams emitted by femtosecond laser to reveal surface spin waves in bismuth iron garnet thin film. Beams that are larger than 10 μm in diameter generate both surface and volume spin waves with only one spectral peak near the ferromagnetic resonance. On the contrary, narrower beams excite predominantly surface spin waves of higher frequency, providing an additional peak in the spin wave spectrum. Thus different interference patterns of the magnetization dynamics are achievable. This may significantly broaden the capabilities of spin wave based devices.
Добавил в систему: Белотелов Владимир Игоревич

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