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Area of Science:

  • Condensed matter physics
  • Spintronics
  • Materials science

Background:

  • The spin-motive force (SMF) is a phenomenon in magnetic materials.
  • Surface acoustic waves (SAWs) can interact with magnetic properties.
  • Understanding these interactions is key for novel electronic devices.

Purpose of the Study:

  • To theoretically investigate the spin-motive force (SMF) generated by surface acoustic waves in ferromagnetic materials.
  • To elucidate the underlying mechanisms of SMF generation via spin-vorticity coupling (SVC).
  • To explore the potential for detecting these induced voltages in practical materials.

Main Methods:

  • Theoretical study of spin-vorticity coupling (SVC) in a ferromagnetic monolayer.
  • Analysis of two distinct SMF generation mechanisms: SVC-driven and interplay with magnetoelastic coupling.
  • Modeling the generation of first harmonic, dc, and second harmonic electromotive forces.

Main Results:

  • Identified two mechanisms for SMF generation driven by surface acoustic waves.
  • Demonstrated that SVC and magnetoelastic coupling interplay produces dc and second harmonic voltages.
  • Showed that induced electric voltages can be detected in polycrystalline nickel.

Conclusions:

  • The study provides a theoretical framework for SAW-induced SMF in ferromagnets.
  • The proposed method for generating SMF is simple, not requiring complex device structures or materials.
  • This research broadens the potential applications of SMF in spintronic devices.