Mechanism of Disaccommodation in Ferrite

Abstract

The time decrease of the magnetic permeability after demagnetization, so called disaccommodation, was observed for Ni–Zn ferrite, which had various degrees of oxidation. The effect of the existence of Fe²⁺ ion in disaccommodation was detected. Fe²⁺ facilitates the diffusion of cation and makes the disaccommodation rapid. Moreover, it was concluded that the induced anisotropy caused by the preferential occupation of cation vacancies is large enough to explain the disaccommodation in ferrite. The existence of some difference in diffusion rates among the constituent cations is necessary to explain the disaccommodation in ferrite.