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Resonance due to standing spin waves has been observed in thin films of Permalloy. The results are interpreted in terms of the Kittel spin pinning boundary condition and an ω vs k dispersion relation for good conductors. The method leads to a determination of the exchange constant subject to film thickness uncertainty but to a precise determination of the temperature variation of the exchange constant.
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Seavey et al. (1958) studied this question.
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