Journal
PHYSICAL REVIEW B
Volume 103, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.024411
Keywords
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Funding
- French Investments for the Future Program (PIA) project Lorraine Universite d'Excellence [ANR-15-IDEX-04-LUE]
- Bundesministerium fur Bildung und Forschung Project [05K16IPA]
- Deutsche Forschungsgemeinschaft [BA 2281/11-1]
- Alexander von Humboldt Foundation
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This paper investigates the magnetic, optical, and lattice responses of a Pt/Cu/Bi1Y2Fe5O12/Gd3Ga5O12 heterostructure to femtosecond laser excitation, revealing the generation of high-frequency standing spin waves in the dielectric Bi1Y2Fe5O12 layer through phonon-induced change of magnetic anisotropy. It is found that incoherent phonons can lead to both fast and slow decreases of magnetic order through different spin-phonon interaction scenarios.
In this paper, we investigate the magnetic, optical, and lattice responses of a Pt/Cu/Bi1Y2Fe5O12/Gd3Ga5O12 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 Bi1Y2Fe5O12 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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