Dissipative function of a ferromagnet and the theory of Onsager's kinetic equations

It is shown that using the general theory of Onsager's kinetic equations allows us to build a model for a dissipative function for a ferromagnet, as well as the corresponding relaxation component in the Landau-Lifshitz equation. We present a model for constructing the dissipative function for ferromagnets with varying symmetries. We show the fundamental role of the effective magnetic field, first introduced by Landau and Lifshitz.