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High frequency magnetic properties and microstructure of NiZn/Co2Z composite ferrite material

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6 Author(s)
Zongliang Zheng ; State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People’s Republic of China ; Zhang, Huaiwu ; Xiao, John Q. ; Yang, Qinghui
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The NiZn(Ni0.4Zn0.6Fe2O4) spinel ferrite and Co2Z(Ba3Co2Fe24O41) hexagonal ferrite composite materials with the various Co2Z contents have been synthesized by the solid-state reaction method. The phases and microstructures of the sintered ceramics have been analyzed. The results show that Co2Z grains exist as a secondary phase in composites and remarkably affect the grain size and the static and high-frequency magnetic properties. With the addition ratio of Co2Z varying from 0 wt. % to 30 wt. %, the saturation magnetization only changes slightly and is closely related to the density of sintered composites. Meanwhile, the initial permeability decreases and the cut-off frequency expands from 7 MHz to 300 MHz. In addition, the product (μi - 1)fr of composites is much larger than that of the pure NiZn spinel ferrite.

Published in:

Journal of Applied Physics  (Volume:111 ,  Issue: 7 )

Date of Publication:

Apr 2012

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