Magnetic properties and dual band microwave absorption in conjunction with red shifted resonance of γ-Fe2O3 linked with 2-BOP dispersed on graphene oxide

Owing to the rapid uses of high frequency electronic devices, microwave-absorbing materials have received a lot of attention. For this γ-Fe₂O₃ linked with 2-Benzyl Pyridine dispersed on graphene oxide was synthesized. Structural, morphological and elemental compositions were studied by X-ray diffraction, FESEM and X-ray photoelectron spectroscopy data. This γ-Fe₂O₃-2BOP@GO exhibits efficient microwave absorption (−46.65 dB) in a relatively wide range of frequency (∼ 6.6 GHz). Conversion of magnetic energy to the corresponding dielectric energy without causing any changes to the total electromagnetic energy was detected and explained for the first time. Magnetocrystalline anisotropy helped to enhance the eddy losses. Apart from eddy loss, and leakage conductivity losses, presence of both exchange and natural resonance in conjunction with a red shifted resonance improves the absorption bandwidth even further. Incorporation of GO improves the better impedance matching and also increases the values of attenuation constant.