Abstract
Curie temperature, initial permeability and resistivity of MnZn ferrites with Fe-poor composition (less than 50 mol% of Fe 2O 3) are studied. The experience formula of Curie temperature for MnZn ferrites with Fe-rich composition is modified to calculate the Curie temperature of Fe-poor MnZn ferrites. Tri-segment frequency dispersion model, which consists of domain wall motion, magnetization rotation and gyro-magnetic spin rotation, is used to simulate the permeability spectra of ferrites. The permeability of Fe-poor MnZn ferrites compares with that of Fe-rich MnZn ferrites in low frequency region, and it is still high enough to compare with that of NiZn ferrites in high frequency region. The resistivity of Fe-poor MnZn ferrites is about 10 3 Ω m, much higher than that of Fe-rich MnZn ferrites.
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