PERMEABILITY MECHANISMS IN MANGANESE ZINC FERRITES

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Abstract
The anisotropy of demagnetization is used to estimate the relative contributions of walls and rotations to the permeability. In a high permeability ferrite both µr and µw were at a maximum at the compensation temperature as was the hysteresis coefficient ν. In a small grain, low-loss ferrite µr was then at a maximum, but µw and ν were at minima. This is explained by the thickness of the domain wall becoming comparable to the grain size, and this is probably the underlying mechanism responsible for the low residual loss. The effect of the spins being pinned at the grain boundaries is discussed

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