Magnetic Characteristic Changes in Polished Ferrites

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Abstract
The worked layers of polished ferrites were estimated by electron-diffraction method and the principal mechanism of magnetic characteristic changes was clarified. Effective non-magnetic layer of abraded ferrites can be estimated by measuring reluctance of a toroidal core with worked layers perpendicular to magnetic path : the depth of the layer was obtained by the method as 0.2μm for polished Ni-Zn ferrites, when its plastic deformation layer was 0.6μm from the measurement by the electron-diffraction method. On the other hand, the change of permeability in the ferrite thin plate with abraded surface can be explained by magnetostrictive effect caused by residual stress of worked layer. In this work, the relation between permeability and stress is deduced, and is proved by measuring the residual stresses, magnetostriction constants and permeabilities of Mn-Zn ferrite single crystal.

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