[8a-E208-1~11] 10.2 Fundamental and exploratory device technologies for spin

9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[8a-E208-1] Effective damping in surface-acoustic-wave-driven magnetization dynamics of ferromagnetic thin films

〇(DC)Masahiko Yunokizaki¹, Yasuhiro Todaka¹, Masashi Kawaguchi¹, Masamitsu Hayashi¹ (1.Dep. Phys., Univ. Tokyo)

Keywords:

phonon magnon coupling,surface acoustic wave,magnetic damping

Surface acoustic waves (SAWs) can drive magnetization dynamics in ferromagnetic thin films through strain-mediated magnetoelastic coupling. In this study, we investigate SAW-driven magnetization dynamics using ferromagnetic thin films integrated with SAW cavity structures on 128 deg Y-cut LiNbO3 substrates. SAW transmission spectra were measured as a function of external magnetic field using a vector network analyzer. Clear changes in the transmission spectra were observed at the magnetic resonance condition, indicating coupling between the acoustic cavity mode and the ferromagnetic resonance mode. From the magnetic-field dependence of the acoustic linewidth, we evaluate the phonon-magnon coupling strength. We also estimate the effective damping parameter under SAW excitation. These results provide insight into strain-mediated phonon-magnon coupling and spin-lattice dissipation in ferromagnetic thin films.