Magnetic Resonance in Ferrimagnetics

Abstract

It is shown that the general expression for the magnetic resonance frequency of the two-sublattice model of a ferrimagnetic crystal has essentially the same form as that originally obtained for the ferromagnetic case provided that the product of the molecular field coefficient and the net magnetization is large compared to the applied and anisotropy fields. The special cases of vanishing magnetization and angular momentum are considered separately, and the relation of these results to the theory of antiferromagnetic resonance is discussed.