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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 Ni
Fe
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.
栗宗 勇貴*; 松尾 衛; 前川 禎通; 能崎 幸雄*
Physical Review B, 102(17), p.174413_1 - 174413_7, 2020/11
被引用回数：16 パーセンタイル：71.59(Materials Science, Multidisciplinary)A nonuniform vorticity of lattice deformation in a surface acoustic wave (SAW) can generate a spin current (SC) in nonmagnetic metals via spin-vorticity coupling (SVC). We demonstrated a strong enhancement of SVC derived SC generated in Cu and Pt films with increasing the frequency of the SAW by observing the spin-wave resonance (SWR) in an adjacent NiFe film. The comparative amplitudes and high-order frequency variations of SWR in NiFe/Cu and NiFe/Pt bilayers imply that the amplitude of the SC generated via SVC in a SAW is robust against the strength of spin-orbit interaction in nonmagnetic metals.
栗宗 勇貴*; 松尾 衛; 能崎 幸雄*
Physical Review Letters, 124(21), p.217205_1 - 217205_6, 2020/05
被引用回数：36 パーセンタイル：91.19(Physics, Multidisciplinary)強磁性薄膜における表面弾性波による磁気ジャイロ効果由来のスピン波共鳴に関して報告する。NiFe薄膜における磁気ジャイロ効果由来のスピン波共鳴の強度はNi薄膜における磁歪由来のものより高調波成分をふくむ。この周波数依存性は表面弾性波によって生じる格子の局所的回転運動により理解できる。スピン波共鳴の周波数依存性から磁歪によるスピン波共鳴を分離することが可能である。
