Abstract
Our previous report shows that Mn-Zn-Ti ferrite with Fe-poor composition (less than 50 mol% of Fe2O3) sintered in air exhibits a high resistivity and initial permeability at frequencies above 1 MHz. We examined Fe-poor ferrite sintered in N2 like conventional Mn-Zn ferrite with Fe-rich composition in order to further improve the initial permeability. Sintering the Fe-poor ferrite in N2 leads to a decrease in the phase of α-Fe2O3 in the surface layer of the ferrite, resulting in an improvement of the initial permeability at frequencies below 1 MHz. As a result, the novel ferrite exhibits a high initial permeability in a wide range of frequencies.
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