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Spin-wave instabilities in large-scale nonlinear magnetization dynamics.

G Bertotti1, I D Mayergoyz, C Serpico

  • 1Istituto Elettrotecnico Nazionale Galileo Ferraris, Corso M. d'Azeglio 42, I-10125 Torino, Italy.

Physical Review Letters
|December 12, 2001
PubMed
Summary
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Large magnetization motions in uniaxial systems are analytically studied. Instability conditions reveal that sufficiently large motions are always stable, unlike smaller ones which can become unstable.

Area of Science:

  • Physics
  • Condensed Matter Physics
  • Magnetism

Background:

  • Understanding the dynamics of magnetization is crucial in magnetic systems.
  • Ferromagnetic resonance (FMR) is a key phenomenon for studying magnetic properties.
  • Spin-wave instabilities can disrupt ordered magnetic states.

Purpose of the Study:

  • To analytically investigate the stability of large magnetization motions.
  • To derive general instability conditions for driven magnetic systems.
  • To compare derived conditions with existing theories like Suhl's theory.

Main Methods:

  • Analytical study of magnetization dynamics.
  • Derivation of instability conditions for arbitrary driving field parameters.
  • Analysis in the limit of small motions to recover known results.

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Main Results:

  • General instability conditions for magnetization motion were derived.
  • These conditions reduce to Suhl's spin-wave instability theory in the small motion limit.
  • Input power for spin-wave instabilities is bounded, implying stability for large motions.

Conclusions:

  • Large amplitude magnetization motions in uniaxial systems are inherently stable.
  • The stability of uniform motions is dependent on their preparation history.
  • The findings provide a comprehensive understanding of driven magnetic system stability.