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

Steffen Peer Zeuschner; Xi-Guang Wang; Marwan Deb; Elena Popova; Gregory Malinowski; Michel Hehn; Niels Keller; Jamal Berakdar; Matias Bargheer

arXiv · 2203.07851

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

Steffen Peer Zeuschner·Xi-Guang Wang·Marwan Deb·Elena Popova·Gregory Malinowski·Michel Hehn·Niels Keller·Jamal Berakdar·Matias Bargheer

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Abstract

Based on micromagnetic simulations and experimental observations of the magnetization and lattice dynamics following 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 magnetoelastic 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-acoustic 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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Steffen Peer Zeuschner, Xi-Guang Wang, Marwan Deb, Elena Popova, Gregory Malinowski, Michel Hehn, Niels Keller, Jamal Berakdar, Matias Bargheer. 2022-03-15. Standing spin wave excitation in Bi:YIG films via temperature induced anisotropy changes and magnetoacoustic coupling. https://arxiv.org/abs/2203.07851

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