Abstract
The relaxation time of relaxation phenomenon and frequency dispersion of complex permeability have been investigated in system of MgCuZn ferrites. From the measurement of temperature dependence of imaginary part of complex permeability, the relaxation time at infinite temperature is calculated as about 10-12sec. From the analysis of frequency dispersion, the natural resonance frequency does not agree with the one calculated from Snoek's limit and initial permeability measured in the MgCuZn ferrite with relaxation phenomenon. From the consideration of the activation energy and the relaxation time, it is suggested that the relaxation phenomena by CuO substitutions in MgCuZn ferrites occur by the induced magnetic anisotropy with mutual interaction between electron movement and lattice vibration.
