Kobayashi D, Yoshikawa T, Matsuo M, Iguchi R, Maekawa S, Saitoh E, Nozaki Y
Department of Physics, Keio University, Yokohama 223-8522, Japan.
Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan.
Phys Rev Lett. 2017 Aug 18;119(7):077202. doi: 10.1103/PhysRevLett.119.077202. Epub 2017 Aug 16.
We demonstrate the generation of alternating spin current (SC) via spin-rotation coupling (SRC) using a surface acoustic wave (SAW) in a Cu film. Ferromagnetic resonance caused by injecting SAWs was observed in a Ni-Fe film attached to a Cu film, with the resonance further found to be suppressed through the insertion of a SiO_{2} film into the interface. The intensity of the resonance depended on the angle between the wave vector of the SAW and the magnetization of the Ni-Fe film. This angular dependence is explicable in terms of the presence of spin transfer torque from a SC generated via SRC.
我们展示了在铜膜中利用表面声波（SAW）通过自旋旋转耦合（SRC）产生交变自旋电流（SC）的过程。在附着于铜膜的镍铁膜中观察到了由注入SAW引起的铁磁共振，并且进一步发现通过在界面处插入SiO₂膜，该共振被抑制。共振强度取决于SAW的波矢与镍铁膜磁化强度之间的夹角。这种角度依赖性可以通过经由SRC产生的SC所产生的自旋转移力矩来解释。
