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  • Letter

Einstein–de Haas phase shifts in surface acoustic waves

Shoma Tateno1, Yuki Kurimune1, Mamoru Matsuo2,3,4,5, Kazuto Yamanoi1, and Yukio Nozaki1,6,*

  • 1Department of Physics, Keio University, Yokohama 223-8522, Japan
  • 2Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, No. 3, Nanyitiao, Zhongguancun, Haidian District, Beijing 100190, China
  • 3CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
  • 4RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
  • 5Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, 319-1195, Japan
  • 6Center for Spintronics Research Network, Keio University, Yokohama 223-8522, Japan

  • *nozaki@phys.keio.ac.jp
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Phys. Rev. B 104, L020404 – Published 9 July, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L020404

Abstract

We demonstrate the phase shift of the Rayleigh-type surface acoustic wave (RSAW) in a ferromagnetic Ni81Fe19 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 for controlling spin-mechatronics devices without magnetoelastic torque which is specific to a certain material.

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Phys. Rev. B 104, L020404– Published 9 July, 2021
  • Received 21 December 2020
  • Accepted 22 June 2021
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