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立野 翔真*; 栗宗 勇貴*; 松尾 衛; 山野井 一人*; 能崎 幸雄*
Physical Review B, 104(2), p.L020404_1 - L020404_5, 2021/07
被引用回数:10 パーセンタイル:67.5(Materials Science, Multidisciplinary)We demonstrate the phase shift of the Rayleigh-type surface acoustic wave (RSAW) in a ferromagnetic NiFe film based on the gyromagnetic Einstein-de Haas (EdH) torque that can be attributed to the back action of spin-wave excitation. The EdH torque modulates the transverse velocity of the bulk acoustic wave that causes the bipolar phase shift of RSAW. When compared with a magnetoelastic torque, the phase shift can be more prominently enhanced by increasing the frequency. The gyromagnetic torque in the RSAW paves the way.
立野 翔真*; 岡野 元基*; 松尾 衛; 能崎 幸雄*
Physical Review B, 102(10), p.104406_1 - 104406_9, 2020/09
被引用回数:14 パーセンタイル:67.25(Materials Science, Multidisciplinary)In many interacting-electron systems, the microscopic spin angular momentum of electrons is conserved along with the macroscopic angular momentum in electrical current flows, i.e., vorticity. Such spin-vorticity coupling expands the choice of materials for spintronics devices. In this paper, we evaluate the magnitude of an alternating spin current generated by the spin-vorticity coupling with a gigahertz-order surface acoustic wave in a Cu thin film. We measure the gigahertz alternating spin current by an electrical method based on the inverse spin-Hall effect. From the amplitude of the spin current, we can determine the conversion efficiency of the angular momentum between local lattice rotation and electron spin in the Cu film. The conversion efficiency is four orders of magnitude larger than the case of spin current generation via kilohertz-order vorticity in turbulent flow of liquid mercury.