High frequency magnetic mechanism of Ni-substituted Co2Z hexagonal ferrite

The magnetic properties, especially the high frequency magnetic mechanism, of Ni-substituted Co2Z hexagonal ferrite were studied. The polycrystalline Z-type hexagonal ferrite of Ba3NixCo2−xFe24O41 (0 ≤ x ≤ 2) were prepared by solid-state reaction. The results indicate that Ni-substituted Co2Z samples all exhibit typical soft magnetic character. Substitution of Ni for Co will turn the planar magnetocrystalline anisotropy of Co2Z to uniaxial anisotropy when x ≥ 1, so that the permeability drops dramatically and domain wall resonance appears in the frequency spectra. With the rise of Ni amount or sintering temperature, domain wall resonance strengthens gradually.