Mechanism of Disaccommodation in Ferrites

Theory and experimental techniques developed in the study of the uniaxial anisotropy in iron-cobalt ferrites have been applied to the disaccommodation phenomena in ferrites. The results have shown clearly and quantitatively that the underlying mechanisms are essentially the same in these two phenomena, i.e., process of reorientation of the ionic configuration through vacancy migration mechanism. Differences are only in the magnitude of the anisotropy induced and of the activation energy of the migration. It has been shown by applying fine techniques of controlling the amount of cation vacancies that the disaccommodation of high quality manganese-zinc ferrites with µ 0 =5300 is easily controlled and the value Δ µ 0 /µ 0 of less than 0.02% at 10 3 seconds after A.C. de-magnetization has been obtained without loss in quality.