Three-Wave Interactions of Spin Waves
نویسنده
چکیده
Spin waves are waves of dynamical magnetization which can be excited in ferromagnetic materials. These waves can be thought of as slow electromagnetic waves. However, electromagnetic waves in a vacuum are described completely by Maxwell’s equations, and spin waves are not. To describe the dynamics of spin waves, one needs to consider the Landau-Lifshitz equation in addition to Maxwell’s equations. This article will give a heuristic derivation of the Landau-Lifshitz equation, and use it to analyze spin waves in an unbounded medium. An overview of the linear theory of spin waves in an infinite medium will be given, and nonlinear equations that describe the three-wave interaction of spin waves propagating in an infinite medium will be derived from the Landau-Lifshitz equation.
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