In this study, SrFe₁₁MnO₁₉/CoFe_1.9Bi_0.1O₄ ferrite nanocomposites were synthesized with different mass ratios at 900 ^°C for 4 h by a sol-gel method. The Fourier-transform infrared spectroscopy (FT-IR) analysis indicates that by increasing the mass ratio of the spinel to hexagonal, (Sr–O) vibration bonds which are located in the tetrahedral sites, are eliminated. X-ray diffractometer (XRD) reveals the simultaneous existence of the hexaferrite and spinel ferrite phases in composites. Also, the maximum value of ${\left(\text{B}.\text{H}\right)}_{\text{max}}$ has belonged to the sample of h/s = 1/4. The field emission scanning electron microscopy (FESEM) of the samples indicated that the particle shapes in hard and soft phases are cylindrical and spherical (or cubic) respectively. Furthermore, vector network analysis (VNA) in X-band, showed that the minimum reflection loss (R _L) among nanocomposites has belonged to h/s = 1/4 sample, which occurs at a frequency of 8.6 GHz and its value is equal to −21.5 dB.

本研究采用溶胶-凝胶法在900 ^℃下合成了质量比为4 h的SrFe ₁₁ MnO ₁₉ / CoFe _1.9 Bi _0.1 O ₄铁氧体纳米复合材料 。傅立叶变换红外光谱（FT-IR）分析表明，通过增加尖晶石与六边形的质量比，消除了位于四面体位置的（Sr–O）振动键。X射线衍射仪（XRD）揭示了复合材料中同时存在六方铁氧体和尖晶石铁素体相。另外，最大值${（\text{乙}。\text{H}）}_{\text{最高}}$属于h / s = 1/4的样本。样品的场发射扫描电子显微镜（FESEM）表明，硬相和软相中的颗粒形状分别为圆柱形和球形（或立方）。此外，X波段的矢量网络分析（VNA）表明，纳米复合材料之间的最小反射损耗（R _L）属于h / s = 1/4样本，发生在8.6 GHz频率，其值等于至-21.5 dB。