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The semiclassical resonance theory for a system of coupled magnetic sublattices is briefly reviewed and some similarities and differences of ferromagnetic and ferrimagnetic resonance considered. The use of the effective gyromagnetic ratio simplifies the interpretation of many experimental results for g-values. The qualitative application of this concept to some related phenomena shows that they can have features characteristic of the ferrimagnetic case.
Roald K. Wangsness (1956) studied this question.