The Contribution of Dislocations to the Magnetocrystalline Energy and Their Effect on Rotational Hysteresis Processes

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Abstract
Internal stresses of dislocations interact in ferromagnetic crystals with the spontaneous magnetization through the magnetoelastic coupling energy. The magnetic free energy (MFE) of a straight dislocation line is calculated by means of Brown's micromagnetic equations. This energy corresponds to a magnetostrictive contribution to the magnetocrystalline energy which is superimposed on that of the ideal crystal. In a material with isotropic magnetostriction the MFE of a straight edge dislocation line possesses orthorhombic symmetry. The theoretical results may be compared with those of an investigation of magnetization processes of plastically deformed Ni single crystals by Köster. Analysis of measurements of the magnetostriction and of the increase of magnetization as a function of the applied field has shown that in deformed Ni crystals the MFE of the dislocations may become comparable to the magnetocrystalline energy constant K1 of the ideal crystal.

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