Abstract
DC-bias superposition characteristics of low-temperature-fired NiCuZn ferrites have been investigated for the stability of magnetic components. Different amount of SiO2 doped NiCuZn ferrites (low-permeability-composition, group A and high-permeability-composition, group B) were prepared by the conventional ceramic method. All XRD patterns of A and B exhibited single spinel phase, while the average grain size and sintered density gradually decreased with increasing SiO2 content, 0.35 wt% SiO2 doped ferrite A possessed similar permeability with 0.75 wt% SiO2 doped ferrite B. The latter sample presented a better DC-bias-superposition characteristic owing to the thicker nonmagnetic grain boundary and the higher coercivity. The declining rate of incremental permeability under high superposition magnetic fields was slower for the ferrite B with more SiO2 addition, indicating a better DC-bias superposition characteristic for electronic devices.
Published Version
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