The effect of the microstructure on the DC-bias superposition characteristic of NiCuZn ferrite

Abstract The effects of combinational additive on the DC-bias superposition characteristic of NiCuZn ferrite were investigated experimentally. The composite NiCuZn ferrite was prepared by a conventional ceramic method. The sharp decrease of the permeability can be avoided when the magnetic field is small. It is because the permeability is mainly attributed to the χ s p i n with fine grain size. Owing to the thicker nonmagnetic grain boundary, samples with good DC-bias superposition characteristic can be obtained by special combinational additions. Composite addition of Bi 2 O 3 , AlBSi glass, and SnO 2 can both retard the grain growth and increase the thickness of the nonmagnetic grain boundary δ . Finally, an excellent performance sample was obtained.