Comparative study of structural and magnetic properties of Ni and La substituted calcium hexaferrite

Ni and La substituted M-type Ca hexaferrite of composition CaNi1Fe11O19 CaLa1Fe11O19 were synthesized by sol-gel auto combustion method using metal nitrates as oxidants citric acid reducing agent. The prepared samples characterized X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), energy dispersive analysis (EDAX), vibrating sample magnetometry (VSM). XRD study revealed that both had lattice parameters a c within the range hexaferrite. SEM micrographs displayed grains having irregular shapes sizes in nanometer range. FTIR peaks confirmed structure EDAX spectra showed homogeneous distribution ions samples. In CaNi1Fe11O19, we found saturation magnetization (Ms) 12.18 emu/g coercivity (Hc) 193.2 Oe. On other hand, CaLa1Fe11O19, Ms 0.55 Hc 404.4 Saturation values obtained for are suitable low-density magnetic recording devices.