[19p-P1-1~74] 10 Spintronics and Magnetics（Poster）

[19p-P1-39] Spin Current Generation Using Mechanical Rotation of Surface Acoustic Wave

〇Daima Kobayashi¹, Ryo Takahashi^2,3,4, Ryo Iguchi^2,4, Mamoru Matsuo^2,3, Sadamichi Maekawa^2,3, Eiji Saitoh^2,3,4,5, Yukio Nozaki¹ (1.Keio Univ., 2.ERATO-SQR, 3.JAEA-ASRC, 4.Tohoku Univ.-IMR, 5.Tohoku Univ.-WPI-AIMR)

Keywords:spin current,surface acoustic wave,mechanical rotation

Spin current generation is one of the key issues in the research field of spintronics. From the view point of developing low power consuming devices, the spin current must be generated by other than electrical current because the energy loss due to the Joule heating should be minimized. Recently, it has been theoretically suggested that alternating spin current can be generated in a nonmagnetic metal using Rayleigh-type surface acoustic wave(RSAW).
We have experimentally demonstrated the generation of alternating spin current in Cu/NiFe bilayer by using RSAW with frequency of an order of GHz. As a result, Microwave absorption due to FMR excitation in NiFe layer was successfully observed in the microwave transmission coefficient of IDTs as functions of microwave frequency and external magnetic field. The insertion of insulating layer between Cu/NiFe bilayer strongly suppressed the FMR excitation. This result implies that the spin current was generated by mechanical rotation of RSAW.