A Study of the Electromagnetic Absorption Properties of FeNi₃@MnO₂/FeNi₃

FeNi3@MnO₂/FeNi₃ (FMF) nanocomposite with different weight ratios of FeNi₃ to FeNi₃@MnO₂ was prepared under 100 ℃ for 3 h. Then, these compounds’ structural and microstructural properties were characterized using X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy. Also, the electromagnetic properties of the samples were characterized using a vibrating sample magnetometer, and microwave absorption in the 2–18 GHz frequency range. The results show that the magnetic characteristics of the samples increased with the increase in the ratio of FeNi₃ nanoparticles. However, the excessive growth of FeNi₃ nanoparticles decreased the dielectric properties (the dielectric constant) so that the electrical conductivity of the FMF (4) sample is lower than the FMF (3) sample. The reflection loss of the FMF (1) sample was better than the other samples and about − 27 db.