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The unidirectional rotational hysteresis in a uniaxial Permalloy film has been studied as a function of a rotating steady field and a steady field in the bulk easy direction. Observations were made of both the angular bounds and the magnitude of the unidirectional rotational hysteresis. The results are consistent with a model in which the film is considered as being a uniaxial matrix containing a small volume fraction of regions with randomly oriented anisotropies. The effect of the matrix on the regions is taken as being a field parallel to the magnetization of the matrix.
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Doyle et al. (1963) studied this question.
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