We report the tunable electromagnetic (EM) wave absorption properties of Fe-deficient SrFe_9.6-xCo_1.2Ti_1.2O₁₉ hexaferrite–epoxy composites. SrFe_9.6-xCo_1.2Ti_1.2O₁₉ hexaferrite powders were prepared via solid-state reaction routes. It was observed that Sr–Ti-rich second phases were formed as x increased, i.e., the Fe content decreased. The ferromagnetic resonance (FMR) frequency of the composites gradually decreased from 8.8 GHz to 4.8 GHz with increasing x, and accordingly, the EM absorption frequency range also gradually changed. The gradual FMR frequency shift was attributed to the compositional shift in the mother phase. It is predicted that the Fe deficiency caused a decrease in the magnetocrystalline anisotropy, and in turn, it shifted the FMR frequency and modified the corresponding EM absorbing properties. All the samples demonstrated a high EM absorption performance with the lowest reflection loss of < −40 dB at the optimized frequency and thickness.

我们报告的Fe缺陷SRFE的可调谐电磁（EM）波吸收性能_{9.6- X}钴_1.2的Ti _1.2 ø ₁₉六方晶系铁氧体的环氧复合材料。SRFE _{9.6- X}钴_1.2的Ti _1.2 ø ₁₉六方晶系铁氧体粉末通过固态反应路线制备。据观察，随着x 的增加，即 Fe 含量降低，形成了富含 Sr-Ti 的第二相。随着x 的增加，复合材料的铁磁共振（FMR）频率从 8.8 GHz 逐渐降低到 4.8 GHz，相应地，电磁吸收频率范围也逐渐发生变化。逐渐的 FMR 频移归因于母相的成分变化。据预测，Fe 缺乏会导致磁晶各向异性降低，进而改变 FMR 频率并改变相应的 EM 吸收特性。所有样品都表现出高 EM 吸收性能，在优化的频率和厚度下具有 < -40 dB 的最低反射损耗。