The 83rd JSAP Autumn Meeting 2022

Presentation information

Oral presentation

10 Spintronics and Magnetics » 10.2 Fundamental and exploratory device technologies for spin

[22p-A205-1~18] 10.2 Fundamental and exploratory device technologies for spin

Thu. Sep 22, 2022 1:30 PM - 6:30 PM A205 (A205)

Shun Kanai(Tohoku Univ.), Kenji Kasahara(Fukuoka Univ.), Itoh Keita(東北大)

2:00 PM - 2:15 PM

[22p-A205-3] Spin-torque FMR induced by acoustic spin Hall effect

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

Keywords:surface acoustic wave, spin current, spin-torque FMR

Surface acoustic wave (SAW) can induce magnetization dynamics in various mechanisms. Recently, we reported that an AC spin current (acoustic spin current) is generated via spin-orbit interaction in heavy metal thin film by SAW (acoutic spin Hall effect). The acoustic spin Hall effect under FMR condition is not explored yet and it is expected to excite magnetization dynamics. In this work, we investigate DC votages developing in W (2 nm)/CoFeB (1 nm) film during SAW excitation with respect to the magnetic field angle and magnitude. The measured voltages show the same angle dependence with conventional spin-torque FMR measurement when the field magnitude is small enough, which suggests that spin-torque FMR is induced by the acoustic spin current.