Highly nonlinear frequency-dependent spin-wave resonance excited via spin-vorticity coupling

スピン渦度結合を介して励起された高度非線形周波数依存スピン波共鳴

栗宗 勇貴*; 松尾 衛; 前川 禎通; 能崎 幸雄*

Kurimune, Yuki*; Matsuo, Mamoru; Maekawa, Sadamichi; Nozaki, Yukio*

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.