Origin of the Induced Magnetic Anisotropy in Nickel Ferrite

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Abstract
The magnetic anisotropy induced in nickel ferrite at room temperature by an applied field has been investigated as a function of composition. The magnitude and time rate of change, or relaxation, of this anisotropy has been studied by measuring the torque produced by an applied magnetic field. Disaccommodation, or the change of permeability with time of multidomain materials, is a direct result of this relaxation. The relaxation times are independent of composition and the magnitude of the anisotropy is not simply related to the concentration of cation vacancies or Fe2+ ions; this behavior of the induced anisotropy cannot be explained by either electron or cation migration. A model, consistant with the experimental results, is suggested in which the induced anisotropy is the result of preferentially oriented, localized Jahn-Teller distortions. The distortions arise from Ni2+ ions on the tetrahedral (A) sites of the spinel lattice.

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