In a ferromagnetic alloy the dependence of the coercive force HC and the initial susceptibility χa on the size and the number of non-magnetic inclusions has been experimentally investigated. Cylindrical single crystals with their rod axis parallel to the magnetic soft direction have been used as specimens. The material PE 16 is a commercial Ni-based alloy which by suitable heat treatment precipitates spherical, non-magnetic particles of Ni3(Al, Ti), which do not strain the matrix. The dependence of HC and χa on the particle diameter d is in agreement with theoretical predictions. The relation between these two parameters and the volume fraction v cannot be described by the corresponding equations. This discrepancy is probably due to the fact that the Bloch-Wall geometry within the specimen does not remain constant with varying v. The product HC · χa has been found independent of v and d.
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Brion et al. (1974) studied this question.
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