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Spin pumping driven by bistable exchange spin waves.

K Ando1, E Saitoh

  • 1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan. ando@imr.tohoku.ac.jp

Physical Review Letters
|October 4, 2012
PubMed
Summary
This summary is machine-generated.

Parametric excitation of spin waves in platinum/yttrium iron garnet films selectively enhances spin wave relaxation. This reveals strong spin-wave spin-current coupling and unconventional bistability in exchange spin waves.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Spin pumping is a key phenomenon in spintronics for generating spin currents.
  • Exchange spin waves are fundamental excitations in magnetic materials.
  • Parametric excitation offers a route to control and study nonlinear spin dynamics.

Purpose of the Study:

  • To demonstrate spin pumping driven by bistable exchange spin waves.
  • To investigate the selective enhancement of short-wavelength spin wave relaxation.
  • To explore nonlinear spin wave dynamics and bistability using parametric excitation.

Main Methods:

  • Fabrication of platinum/yttrium iron garnet (Pt/Y3Fe5O12) thin films.
  • Application of parametric excitation to induce spin waves.
  • Measurement of spin pumping effects via the inverse spin Hall effect.

Main Results:

  • Demonstrated spin pumping driven by bistable exchange spin waves.
  • Observed selective enhancement of short-wavelength exchange spin wave relaxation.
  • Indicated strong coupling between exchange spin waves and spin currents at the interface.
  • Revealed unconventional bistability of exchange spin waves.

Conclusions:

  • Parametric excitation selectively enhances exchange spin wave relaxation, indicating efficient spin transfer.
  • The study provides direct access to nonlinear spin wave dynamics and reveals bistability.
  • This work highlights the potential of parametric spin pumping for controlling spin currents and understanding magnetic excitations.