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Generation of spin waves via spin-phonon interaction in a buried dielectric thin film

Abstract : In this paper, we investigate the magnetic, optical, and lattice responses of a Pt/Cu/Bi 1 Y 2 Fe 5 O 12 /Gd 3 Ga 5 O 12 heterostructure to femtosecond laser excitation of the opaque Pt/Cu metallic bilayer. The electronic excitation generates coherent and incoherent phonons, which trigger high-frequency standing spin waves (SWs) in the dielectric Bi 1 Y 2 Fe 5 O 12 layer via a phonon-induced change of magnetic anisotropy. We find that the incoherent phonons (heat) can induce a fast (<1ps) and slow (>1000 ps) decrease of the magnetic order by different spin-phonon interaction scenarios. These results open perspectives for generating high-frequency SWs in buried magnetic garnets.
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https://hal.univ-lorraine.fr/hal-03113275
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Submitted on : Monday, January 18, 2021 - 11:35:58 AM
Last modification on : Thursday, September 2, 2021 - 1:21:41 PM
Long-term archiving on: : Monday, April 19, 2021 - 6:45:32 PM

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Marwan Deb, Elena Popova, Steffen Zeuschner, Michel Hehn, Niels Keller, et al.. Generation of spin waves via spin-phonon interaction in a buried dielectric thin film. Physical Review B, American Physical Society, 2021, 103, pp.024411. ⟨10.1103/physrevb.103.024411⟩. ⟨hal-03113275⟩

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