Report
Standing spin wave excitation in Bi:YIG films via temperature induced anisotropy changes and magnetoacoustic coupling
| العنوان: | Standing spin wave excitation in Bi:YIG films via temperature induced anisotropy changes and magnetoacoustic coupling |
|---|---|
| المؤلفون: | Zeuschner, Steffen Peer, Wang, Xi-Guang, Deb, Marwan, Popova, Elena, Malinowski, Gregory, Hehn, Michel, Keller, Niels, Berakdar, Jamal, Bargheer, Matias |
| سنة النشر: | 2022 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Other Condensed Matter |
| الوصف: | 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. Comment: 11 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2203.07851 |
| رقم الانضمام: | edsarx.2203.07851 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |