Classical magnetic resonance equation for ordered-state systems

Abstract

The so-called rectangular approach to ferromagnetic resonance equations of Baselgia et al. has been generalized to include magnetic systems of several sublattices. The result is a form of a resonance equation which can be expressed in terms of a Hessian matrix of a general free-energy expression. Explicit expansions of this resonance equation for the cases of one-, two-, and three-sublattice systems in terms of Hessian and interaction matrices are presented. Examples of the reduction of this formalism to some well-known cases are presented.