Spin-Wave Turbulence Beyond the Parametric Excitation Threshold

V. E. Zakharov, V. S. L’Vov, S. S. Starobinets

Research output: Contribution to journalArticle

145 Scopus citations

Abstract

The nonlinear stage of the parametric excitation of spin waves in ferromagnetic dielectrics is reviewed. The main nonlinear mechanism which limits the amplitude of the exponentially growing waves is the “pairing” of waves with equal and opposite wave vectors, which leads to the violation of phase relationships. This effect is described in terms of a Hamiltonian which is diagonal in the wave pairs; The corresponding approximation is called the S theory. Within the framework of this theory, the distribution of the excited waves in κ space is singular: the waves lie on individual lines or points. Consequences of the S theory and their experimental verification are discussed in detail. Collective oscillations of a spin-wave system and the origin of the observed self-modulation of their amplitude are also considered.

Original languageEnglish (US)
Pages (from-to)896-919
Number of pages24
JournalSoviet Physics - Uspekhi
Volume17
Issue number6
DOIs
StatePublished - Jun 30 1975
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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