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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • The acoustic spin Hall effect (ASHE) links spin currents to lattice vibrations using surface acoustic waves (SAWs) in heavy metals.
  • Understanding spin-lattice interactions is crucial for advancing spintronics.

Purpose of the Study:

  • To investigate the reciprocal phenomenon of the ASHE, termed the inverse ASHE.
  • To demonstrate the generation of SAWs from alternating (ac) spin currents.

Main Methods:

  • Utilized a heavy metal-ferromagnet bilayer structure.
  • Injected ac spin currents into the heavy metal layer via interfacial spin backflow.
  • Detected nonlocal SAWs generated by the induced lattice vibrations.

Main Results:

  • Successfully observed and detected spin-current-induced nonlocal SAWs.
  • Demonstrated SAW propagation over distances up to 400 micrometers in an LiNbO3 substrate.
  • Identified the inverse ASHE as the reciprocal process to ASHE.

Conclusions:

  • The inverse ASHE completes the framework of spin-phonon interconversion.
  • This effect reveals a phonon-mediated pathway for long-range spin transport, applicable even in nonmagnetic insulators.