[26a-E201-1~12] 10.2 Fundamental and exploratory device technologies for spin

▲ [26a-E201-7] Spin wave resonance detected from acoustoelectric current in a thin metallic film

〇Hiroki Matsumoto¹, Takuya Kawada¹, Masashi Kawaguchi¹, Masamitsu Hayashi¹ (1.The Univ. of Tokyo)

Keywords:spin wave resonance, acoustoelectric current, surface acoustic wave

Surface acoustic wave (SAW) can induce spin wave resonance (SWR) in a ferromagnetic thin film due to magnetoelastic coupling. Such SAW-driven SWR (SAW-SWR) can be exploited to study the coupling between magnons and acoustic phonons in ferromagnets. With regard to application for quantum computing and communication, achieving coherent interaction between magnons and acoustic phonons is essential.
To investigate strongly coupled magnon-phonon in a conventional SAW device, high-frequency measurement using a spectrum analyzer has often been employed. However, it is difficult to observe the small change in the SAW power associated with the coupling. In the presentation, as a novel approach to the problem, we show that DC measurement of acoustoelectric current can be used to detect the SAW-SWR.