Low loss MnZn-ferrites: frequency dependence of minimum power loss temperature

摘要

A simple method was applied to separate magnetic loss into hysteresis loss, eddy current loss and residual loss. Residual loss becomes dominant at high frequency, and is assumed to be the main cause of the frequency dependence of the minimum loss temperature. The origin of the residual loss is thought to be domain wall resonance. Experiments along this hypothesis have led to new low loss ferrites with magnetic loss of less than 100 kW/m/sup 3/ at 1 MHz, 50 mT and 80 degrees C.