Influence of Second Milling Time on Temperature Dependence of Low Loss MnZn Power Ferrites

Microstructures, magnetic properties, temperature dependence, and improved steinmetz parameters of low loss MnZn power ferrites with different second milling times have been analyzed. The results show that properly increasing second milling time can remarkably increases the magnetic properties and temperature dependence. When the second milling time is two hours, the initial permeability and saturation magnetic induction reach their maximum, while the total power loss achieves its minimum value. The improved steinmetz parameters reveal that when the frequency is increased to a certain extent, the minimum power loss temperature moves to lower temperature, the total effect of temperature on power loss becomes smaller, and the temperature stability of low loss MnZn power ferrites becomes better.