Abstract
In the present work, exchange coupled and non-exchange coupled BaFe12O19 (BaM)/NiFe2O4 (NiF) nanocomposites with varying composition were prepared by adopting two different processing methods. Phase formation and microstructural changes were analyzed by X-ray diffraction (XRD) and Scanning electron microscopy (SEM) respectively. Effect of exchange coupling on magnetic and microwave properties (in Ku-band) were studied by vibrating sample magnetometer and vector network analyzer respectively. XRD patterns confirmed the co-existence of BaM and NiF phases in composites without any secondary phase. SEM micrographs showed the well distinguished BaM and NiF grains in exchange coupled composites. Smooth hysteresis loops were observed for exchange coupled composites in contrast to non-exchanged coupled, which showed stepped-loops for all studied compositions. Higher saturation magnetization (Ms) was also found in exchange coupled composites. Whereas, Ms showed a linear decrease with NiF content in non-coupled composites. Coercivity found to decrease with NiF content with distinct trend among the two systems. Frequency dependent complex permittivity and permeability showed large variation between the two systems. Reflection losses at multiple frequencies were observed in exchange coupled composites.
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