Abstract
The magnetic permeability and the thickness of the so-called non- magnetic grain boundary were studied for a MgMnZn-ferrite with composition Mg 0.8 Zn 0.2 Mn 0.1 Fe 1.85 O 3.925 . For the mono-domain situation the grain size dependence of the effective initial permeability is well described by the nonmagnetic grain boundary model. A gradual increase of permeability with grain size around the transition from mono- to two-domain indicates that the permeability is predominantly rotational in origin. The intrinsic initial permeability and the non-magnetic grain boundary width were obtained from a fit of permeability versus grain size at different temperatures. It is found that the grain boundary thickness decreases with temperature. This suggests that the grain boundary is hard magnetic rather than nonmagnetic.
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