For a composite consisting of magnetostrictive particles dispersed in a nonmagnetostrictive matrix, a simple, approximate model for the effective magnetostriction, defined as the ratio of the magnetostriction of the composite to that of the magnetostrictive component, is described. The predictions of the model compare well with measurements on SmFe2-based composites having Al and Fe matrices.
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Herbst et al. (1997) studied this question.