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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Materials Science

Background:

  • Spin-orbit interaction (SOI) is crucial for generating spin currents.
  • Surface acoustic waves (SAWs) can induce mechanical motion in materials.
  • Understanding spin current generation in nonmagnetic materials is key for spintronic devices.

Purpose of the Study:

  • To observe and characterize the acoustic spin Hall effect.
  • To investigate the role of spin-orbit interaction in lattice motion-induced spin currents.
  • To explore the potential of using acoustic waves for spin current generation.

Main Methods:

  • Excitation of surface acoustic waves (SAWs) in nonmagnetic metal (NM) layers.
  • Measurement of acoustic voltage in NM/ferromagnetic metal bilayers.
  • Systematic variation of NM layer thickness and analysis of frequency dependence.

Main Results:

  • Observation of a spin current flowing orthogonal to SAW propagation in NMs.
  • Acoustic spin Hall effect manifested as a field-dependent acoustic voltage.
  • Acoustic voltage maximized near the spin diffusion length, scaled with SOI and lattice displacement rate.

Conclusions:

  • Lattice motion, driven by SAWs, can induce spin current via spin-orbit interaction.
  • The acoustic spin Hall effect provides a novel pathway for spin current generation.
  • This study highlights the potential of lattice dynamics in strong spin-orbit metals for spintronics.