Analysis of power loss in Ni–Zn ferrites.

The power loss (P[sub cv]) was analyzed by combining two methods. The first, P[sub cv], is divided into hysteresis loss (P[sub h]) and residual loss (P[sub r]) from the frequency dependence of the power loss according to the method of Otsuki et al., and, second, the loss factors are attributed to domain wall motion (P[sub w]) and the rotation magnetization (P[sub rot]) by adapting the method proposed by Visser et al. It was found that P[sub w] coincides with P[sub h] in the lower frequency range, but the difference between them becomes significant as frequency goes up. The higher value of P[sub w], in comparison with P[sub h] in the higher frequency range, can be attributed to the enhancement of loss due to the dynamic motion of the domain wall (P[sub wd]) by raising the frequency. The hysteresis loss dominates P[sub cv] in the frequency range below 500 kHz, while P[sub wd] becomes predominant factor in the higher frequency range more than 500 kHz. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]