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Article Dans Une Revue Physical Review B Année : 2022

Standing spin wave excitation in Bi : YIG films via temperature-induced anisotropy changes and magneto-elastic coupling

Marwan Deb
Elena Popova
Grégory Malinowski
Michel Hehn
Niels Keller

Résumé

Based on micromagnetic simulations and experimental observations of the magnetization and lattice dynamics after the direct optical excitation of the magnetic insulator Bi : YIG or indirect excitation via an optically opaque Pt/Cu double layer, we disentangle the dynamical effects of magnetic anisotropy and magneto-elastic coupling. The strain and temperature of the lattice are quantified via modeling ultrafast x-ray diffraction data. Measurements of the time-resolved magneto-optical Kerr effect agree well with the magnetization dynamics simulated according to the excitation via two mechanisms: the magneto-elastic coupling to the experimentally verified strain dynamics and the ultrafast temperature-induced transient change in the magnetic anisotropy. The numerical modeling proves that, for direct excitation, both mechanisms drive the fundamental mode with opposite phase. The relative ratio of standing spin wave amplitudes of higher-order modes indicates that both mechanisms are substantially active.
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Dates et versions

hal-04278426 , version 1 (10-11-2023)

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Steffen Peer Zeuschner, Xi-Guang Wang, Marwan Deb, Elena Popova, Grégory Malinowski, et al.. Standing spin wave excitation in Bi : YIG films via temperature-induced anisotropy changes and magneto-elastic coupling. Physical Review B, 2022, 106 (13), pp.134401. ⟨10.1103/physrevb.106.134401⟩. ⟨hal-04278426⟩
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