针对 NiCuZn 铁氧体材料在 NFC 中的应用,研究了配方中Fe2 O3含量、晶粒尺寸以及 Co2 O3添加量对材料磁谱的影响。采用SEM、Agilent4991A测量了样品的微观形貌和1 MHz~1 GHz 下的磁谱,运用晶粒的临界尺寸理论、磁谱分量理论并结合微观形貌对磁谱形状的差异进行了细致的研究,对于造成磁谱形状差异的机制进行了分析。结果表明,配方中Fe2 O3含量越接近50％,将晶粒控制在单畴,越有利于提高材料的性能。当晶粒处于单畴状态时,Co2 O3添加虽然不会显著地提高谐振频率,但是会减小磁谱中谐振频率与使用截止频率之间的差距,同样会提高材料的性能。
The influence of the Fe2 O3 content in the formula,grain size and the Co2 O3 addition quantity on the magnetic spectra of NiCuZn ferrite materials for the NFC applications was investigated.Micrographs of the sin-tered samples were obtained by using scanning electron microscope,the magnetic spectra were measured by Ag-ilent E4991A impedance analyzer.By using the theory of critical size of grain,magnetic spectral component and combining with the microstructure of the samples,the magnetic spectra had been carried on the detailed study. The difference between the magnetic spectra had been analyzed.The results show that when the Fe2 O3 content in the formula of was closer to 50% and the grains are single-domain,the material was favor to the attainment of better performance.When the grains are single-domain,Co2 O3 apply little contribution to improving the res-onance frequency,but it can reduce the gap between the resonance frequency and cutoff frequency in applica-tion,and also improve the performance of materials.
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