The differential equations for the magnetostatic modes in ferrimagnetic resonance have been rederived including the anisotropy torques. Exact solutions have been obtained for four of the low order modes of a sphere. These solutions differ in general from those for the differential equations not including anisotropy. Excellent agreement was found between measured resonance fields and those predicted by the modified theory.
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Solt et al. (1960) studied this question.
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