محمود ناصری

In order to obtain SrFe12O19 nanoparticles, thermal treatment method was employed, and afterwards SiO2 and TiO2 nanoparticles were embedded in SrFe12O19 matrix SrFe12O19 nanoparticles. The SiO2 and TiO2 nanoparticles' effects were set in SrFe12O19 matrix and experimental techniques which include, transmission electron microscopy (TEM), x-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), x-ray analysis (EDX) and field emission scanning electron microscope (FESEM) were used in studying the physical properties of the prepared nanoparticles. The precise DASF method (derivation of absorption spectrum fitting) was employed in examining the optical properties. The addition of SiO2 and TiO2 nanoparticles to SrFe12O19 matrix resulted in the reduction of energy band gap values in compare with the SrFe12O19 nanoparticles. The chemical analysis of SrFe12O19/SiO2, SrFe12O19 nanoparticles, and SrFe12O19/TiO2 nanocomposites was carried out using energy dispersion X-ray analysis (EDX). Ferromagnetic behaviors were demonstrated by SrFe12O19 nanoparticles, SrFe12O19/SiO2 and SrFe12O19/TiO2 nanocomposites, and the behaviors were validated through the use of a vibrating sample magnetometer (VSM). A wasp-waist was observed through hysteresis loop of SrFe12O19/SiO2 nanocomposites, implying the presence of the two magnetic phases; soft and hard ferromagnetic.