The magnitude of the spin wave stiffness parameter. D and its dependence on temperature in YIG, Fe 3 O 4 and Li-Zn ferrite has been examined and compared with theory. It is shown that values of D obtained using the exchange constants that satisfactorily explain the equilibrium magnetic properties of these systems yield results in agreement with experiment for YIG and Fe 3 O 4 but are inappropriate for the Li-Zn ferrite. The temperature dependence of D in YIG and Fe 3 O 4 is satisfactorily explained on the basis of the interaction of acoustic magnons with optic magnons.
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Srivastava et al. (1987) studied this question.
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