Approximate Solution for the Strain-Induced Deviation of the Magnetization from Saturation in Polycrystalline Cubic Ferrites

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Abstract
The strain‐induced uniaxial magnetic anisotropy can cause a deviation in the magnetization from saturation along the applied magnetic field. An approximate variational solution is found for the necessary threshold strain or stress and for the amplitude of this deviation in thick, semi‐infinite slabs of cubic polycrystalline ferro‐ or ferrimagnetic materials. The resulting solutions are compared to solutions obtained from the linearized Brown's equations for equilibrium. Specific calculations are made for nickel ferrite, YIG, and magnetite.