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Radiation-spin interaction, Gilbert damping, and spin torque.

Jeongwon Ho1, F C Khanna, B C Choi

  • 1Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, Canada.

Physical Review Letters
|April 20, 2004
PubMed
Summary
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Magnetization relaxation processes are explained by radiation-spin interaction (RSI). This interaction, originating from the magnetic material itself, consistently derives the Landau-Lifshitz-Gilbert equation and predicts minor deviations in magnetization saturation.

Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Quantum Mechanics

Background:

  • Magnetization relaxation is crucial for understanding magnetic phenomena.
  • The Landau-Lifshitz-Gilbert (LLG) equation describes magnetization dynamics.
  • Existing models often treat damping and spin torque phenomenologically.

Purpose of the Study:

  • To describe magnetization relaxation processes using radiation-spin interaction (RSI).
  • To derive the LLG equation from a fundamental spin Hamiltonian including RSI.
  • To investigate the effect of RSI on magnetization saturation.

Main Methods:

  • Derivation of the LLG equation from a spin Hamiltonian incorporating RSI.
  • Self-consistent derivation method.
  • Analysis of magnetization vector magnitude deviation from saturation.

Related Experiment Videos

Main Results:

  • Radiation-spin interaction (RSI) provides a microscopic description of magnetization relaxation.
  • The LLG equation, including Gilbert damping and spin torque terms, is derived from the spin Hamiltonian with RSI.
  • RSI leads to a deviation from magnetization saturation of the order O(alpha^2), where alpha is the Gilbert damping parameter.

Conclusions:

  • RSI offers a fundamental explanation for magnetization relaxation mechanisms.
  • The LLG equation can be self-consistently derived from a spin Hamiltonian including RSI.
  • The study reveals a novel, albeit small, deviation from magnetization saturation due to RSI.