Improved Magnetic Properties of SrFe12O19 through Nanocomposite

In the present work, Nanocomposites of hard/soft phases (SrFe12O19)1-x/(CoFe2O4)x with different molar ratio (X= 0.05, 0.10, 0.20) were prepared using standard co-precipitation method followed by physical mixing. The evolution of the structural, microstructural and the magnetic properties with the increase of the CoFo2O4 concentration in the nanocomposites was investigated using different characterization techniques. While X-ray diffraction (XRD) reveals the existence of mixed phases of the spinel ferrite and the M-type hexaferrite. The Scanning Electron Microscopy (SEM) images show that the nanocomposites demonstrate pallets like morphology with different particles size attributed to the existence of two phases. The superconducting quantum interference device magnetometer (SQUID) was used to investigate the magnetic properties of prepared nanocomposites. The magnetic hysteresis loops of all samples showed a good single-phase magnetic behaviour, which proves the exchange-spring interaction between soft magnetic phase (CoFe2O4) and the hard magnetic phase (SrFe12O19). Moreover, the (SrFe12O19)0.95/(CoFe2O4)0.05 nanocomposite exhibits the highest values of the saturation magnetization, remanent magnetization and coercivity. An enhancement of the maximum energy product is achieved for (SrFe12O19)0.95/(CoFe2O4)0.05 with an enhancement of ~ 26.5 % compared to the SrFe12O19 hexaferrite."