In this study, single-phase yttrium iron garnet (YIG) ferrite was synthesized by sol-gel method, which was firstly used as the insulating layer to prepare Fe/YIG soft magnetic composites (SMCs). It was demonstrated that the Fe powders were uniformly coated with the YIG ferrite for the Fe/YIG SMCs. The influence of the YIG content on the soft magnetic properties of the Fe/YIG SMCs were investigated in detail, the results showed that the total core loss (P_cv) of all Fe/YIG SMCs were smaller than pure Fe. The P_cv firstly decreased with increase of the YIG content up to 1.0 wt% (P_cv=2460 mW/cm³, 4 mT/590 kHz), then increased with the increase of YIG from 1.0 wt% to 5.0 wt%. What’s more, the effective permeability (μ_e) of the Fe/YIG SMCs with YIG from 1.0 wt% to 3.0 wt% were higher than that of Fe, confirming both decreased core loss and improved permeability were accomplished in the Fe/YIG SMCs, which demonstrated that the YIG ferrite has good application prospects as new coating layer for SMCs used in medium to high frequency environments.

本研究采用溶胶-凝胶法合成了单相钇铁石榴石（YIG）铁氧体，并首次将其作为绝缘层制备了Fe/YIG软磁复合材料（SMCs）。结果表明，对于 Fe/YIG SMC，Fe 粉末均匀地涂有 YIG 铁氧体。详细研究了 YIG 含量对 Fe/YIG SMC 软磁性能的影响，结果表明所有 Fe/YIG SMC 的总磁芯损耗 ( P cv )_均小于纯 Fe。P _cv首先随着 YIG 含量增加到 1.0 wt% ( P _cv = 2460 mW/ cm ³, 4 mT/590 kHz), 然后随着 YIG 从 1.0 wt% 增加到 5.0 wt% 而增加。此外，YIG 含量为 1.0 wt% 至 3.0 wt% 的 Fe/YIG SMC 的有效磁导率 ( μ _e ) 高于 Fe，证实 Fe/YIG SMC 既降低了铁损又提高了磁导率，表明 YIG 铁氧体作为中高频环境下 SMC 的新型涂层具有良好的应用前景。