I - Static Micromagnetic Effects in FMR

This paper examines the effects of static magnetization dispersion in polycrystalline films on their low field, uniform mode resonance behavior. The quasistatic interaction of the disperse local magnetization with the average magnetization M⇒0, enters the description of FMR through modified initial conditions and through the internal field. The initial nonuniform state alone modifies the low field resonance behavior. In addition, quasistatic free energy minimization yields a dependence of the mean planar equilibrium angle on nonlinear interactions. This causes changes of the resonance frequency and susceptibility magnitude and, under certain conditions, the occurrence of a double resonance.