Variation of the Relaxation Time for NiCuZn Ferrites with Magnetic Properties

The frequency dependence of complex permeability for various NiCuZn ferrites was investigated. The variation of complex permeability for NiCuZn ferrites can be presented as a form of a semi-circle, so called the Cole-Cole plot, and the relaxation phenomena were explained with various shapes of the plots. The relaxation time τ was calculated from frx, which is a relaxation frequency at μmax Relations between anisotropy field H_A and relaxation time τ, initial permeability μi and H_A were plotted to identify the frequency dependence of complex permeability.