NiFe₂O₄/PANI nano-composite with different polyaniline (PANI) content (25%, 50% and 75%) is synthesized. The NiFe₂O₄ (NF) is prepared by the flash auto combustion method and annealed at 400 °C for 2 h. The PANI is prepared by oxidative polymerization of aniline. The X-ray diffraction (XRD) technique confirmed that the NiFe₂O₄ particles are successfully dispersed in the PANI matrix with single phase structure. The characteristic absorption bands are observed from infrared (IR) spectra for the pure NF, pure PANI and their nano-composite. The dielectric constant (\({\varepsilon }^{^{\prime}})\) behavior of NF/PANI nano-composite at higher PANI content tends to be a polymer behavior. The Curie temperature decreased by increasing the PANI content and it is attributed to the basis of A-B exchange interaction due to the variation of \({Fe}^{3+}\) content among the octahedral and tetrahedral sites. The values of the saturation magnetization (Ms), remanence magnetization (Mr), coercivity (Hc), area and squareness (Mr/Ms) are measured by using a vibrating sample magnetometer (VSM).

合成了具有不同聚苯胺含量（25％，50％和75％）的NiFe ₂ O ₄ / PANI纳米复合材料。通过快速自燃法制备NiFe ₂ O ₄（NF），并在400°C下退火2 h。通过苯胺的氧化聚合制备PANI。X射线衍射（XRD）技术证实NiFe ₂ O ₄颗粒已成功分散在具有单相结构的PANI基质中。从红外（IR）光谱观察到纯NF，纯PANI及其纳米复合材料的特征吸收带。介电常数（\（{\ varepsilon} ^ {^ {\ prime}}）\）较高的PANI含量下NF / PANI纳米复合材料的行为往往是聚合物行为。居里温度通过增加PANI含量而降低，并且归因于八面体和四面体位置之间\（{Fe} ^ {3 +} \）含量的变化，这是AB交换相互作用的基础。通过使用振动样品磁力计（VSM）测量饱和磁化强度（Ms），剩磁强度（Mr），矫顽力（Hc），面积和矩形度（Mr / Ms）的值。