Abstract
Deterioration of initial permeability (μi) with respect to frequency and ef ect of Fe2+ on low core loss has been investigated with reference to chemical composition, sintering condition and microstructure on the MnMgZn ferrites. Frequency deterioration of μi increased with MnO addition to the MgZn ferrite most likely. This seems due to a relaxation phenomenon. Relaxation time (τ) and activation energy (Q) were calculated by using the relationshipsωτ=1 and the Bolzmann factor. Activation energies for MgZn and MnMgZn ferrites were found to be 0.14eV and 0.36eV, respectively. Results suggest that the diffusion magnetic aftereffect of MgZn and MnMgZn ferrites is generated by electron and cation migrations, respectively.
