Preparation and Characterization of microwave sintered SrFe12O19/NiFe2O4 nanocomposite

Abstract

In the present work, microwave sintered nanocomposite of NiFe2O4 (NiF) and SrFe12O19 (SrM) in different weight fraction (80/20, 70/30, 60/40, 50/50) were prepared. Their phase, microstructure and magnetic properties were analyzed by X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and Vibrating Sample Magnetometer (VSM) respectively. X-ray diffraction pattern confirmed co-existence of both spinel (NiFe2O4) and hexagonal (SrFe12O19) phases in sintered composites without any secondary phase. Kinked demagnetization curve was observed for powders as well as sintered composites. However kink was more prominent in powder samples. Obtained kink in M-H loops indicating non-exchange coupling between hard/soft phases. Contrary to powders, microwave sintered composites showed higher Ms values from theoretical calculated one confirmed that sintering adequately enhance the coupling between hard/soft phases.