Deb, M.; Popova, E.; Zeuschner, S.P.; Hehn, M.; Keller, N.; Mangin, S.; Malinowski, G.; Bargheer, M.: Generation of spin waves via spin-phonon interaction in a buried dielectric thin film. Physical Review B 103 (2021), p. 024411/1-8
10.1103/physrevb.103.024411
Open Access Version (externer Anbieter)
Abstract:
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 (>1000ps) decrease of the magnetic order by different spin-phonon interaction scenarios. These results open perspectives for generating high-frequency SWs in buried magnetic garnets.