The temperature dependence of the exchange stiffness is taken into account to predict the room-temperature exchange stiffness of substituted YIG films for bubble applications. A simple theory leads to the linear relation of A(T,TN) = AYIG(T)[TN−T)/(TN, YIG −T)] where AYIG(T) is the exchange stiffness of YIG at the ambient temperature T and A(T,TN) is the exchange constant at T of a film with Neél temperature TN. This relation is in reasonable agreement with the recent spin-wave resonance data of Henry and Heinz.
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Slonczewski et al. (1974) studied this question.
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