Impedance spectroscopic study on the magnetization of polycrystalline MnZn ferrite with very low magnetic anisotropy

Magnetization processes of polycrystalline MnZn ferrite with very low magnetic anisotropy were investigated in the Rayleigh region. Complex permeability spectrum of polycrystalline MnZn ferrite has typically one dispersion. However, two dispersions in complex impedance spectrum from which complex permeability are calculated were observed. Topological and magnetostrictive investigations showed that domain wall motion and domain rotation are responsible for the two dispersions. Calculation of individual contributions of domain wall motion and domain rotation showed that both mechanisms play a significant role in the magnetization process of this material. The role of domain wall in magnetic loss was also discussed.