Abstract
The effect of grain size, D, on the intragranular domain state and initial permeability, μi, of polycrystalline MgMnZn ferrites has been investigated. The intragranular domain state is found to change from mono- to two domain at D=2.9±0.2 μm. Despite this change, μi follows a continuous dependence on D, which can be described by the nonmagnetic grain boundary model. The results show that in spinel ferrites with an anisotropy of 72 J/m3, μi is still due to rotation of magnetization.
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