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Spin Current Generation Using a Surface Acoustic Wave Generated via Spin-Rotation Coupling.

D Kobayashi1, T Yoshikawa1, M Matsuo2,3

  • 1Department of Physics, Keio University, Yokohama 223-8522, Japan.

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|September 27, 2017
PubMed
Summary
This summary is machine-generated.

This study shows how surface acoustic waves (SAWs) generate alternating spin currents (SCs) through spin-rotation coupling (SRC) in copper films, impacting nickel-iron film resonance.

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Area of Science:

  • Condensed matter physics
  • Spintronics
  • Acoustoelectric effects

Background:

  • Spin current generation is crucial for spintronics.
  • Surface acoustic waves (SAWs) offer a novel method for manipulating spin currents.
  • Spin-rotation coupling (SRC) is a less explored mechanism for spin current generation.

Purpose of the Study:

  • To demonstrate the generation of alternating spin currents (SCs) via spin-rotation coupling (SRC).
  • To investigate the influence of SAWs on ferromagnetic resonance (FMR) in a Ni-Fe film.
  • To elucidate the role of SRC in mediating spin transfer torque.

Main Methods:

  • Utilizing surface acoustic waves (SAWs) in a copper (Cu) film to induce spin-rotation coupling (SRC).
  • Observing ferromagnetic resonance (FMR) in an attached nickel-iron (Ni-Fe) film.
  • Analyzing the effect of an inserted silicon dioxide (SiO2) layer on FMR intensity.
  • Measuring the angular dependence of FMR intensity relative to the SAW wave vector and Ni-Fe magnetization.

Main Results:

  • Alternating spin currents (SCs) were successfully generated via SRC using SAWs in a Cu film.
  • SAW injection into the Cu/Ni-Fe heterostructure induced observable ferromagnetic resonance (FMR).
  • Insertion of a SiO2 layer at the interface significantly suppressed the FMR intensity.
  • The FMR intensity exhibited a clear angular dependence on the relative orientation of the SAW and Ni-Fe magnetization.

Conclusions:

  • Spin-rotation coupling (SRC) provides an effective route for generating alternating spin currents (SCs) using surface acoustic waves (SAWs).
  • The observed angular dependence of FMR suppression confirms the presence of spin transfer torque originating from the SAW-induced SC.
  • This work highlights the potential of acoustically driven spin currents for spintronic applications.