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Magnetostriction of grain-oriented ferromagnetic cubic materials

The longitudinal magnetostriction of polycrystalline grain-oriented cubic materials, having either a Goss, a cubic or a fibre texture, is studied as a function of the degree of orientation of the grains. The theory has been developed by introducing, in addition to the material magnetostrictive constants λ100 and λ111, two further parameters, τ and W, which are related respectively to the grain dispersion and the volume of cross domains when the material is in the demagnetized or remanent state. The expressions obtained, which yield, for τ=0 and τ -> infinity respectively, the known results for the magnetostriction of a single crystal and a perfect polycrystal, can be used to calculate the cross-domain volume W from magnetostriction measurements, when τ has been independently measured by other methods. Some experimental results on grain-oriented Fe-3% Si strips are given.