Magnetic properties enhancement of M-Ba ferrites embedded in a SiO2 matrix

Abstract M–Ba ferrite powders prepared by the coprecipitation method were embedded, using the sol–gel technique, in an inert silica xerogel matrix. Samples were analysed by X-ray diffraction and vibrating sample magnetometry. We compare the magnetic and structural properties of pure ferrite samples and those embedded in the inorganic matrix. The mixed samples had a proportion of 30% BaFe 12 O 19 :70% SiO 2 in weight. We observed an enhancement of the coercive force in ferrite powders, embedded in the SiO 2 matrix, accompanied by a decrease of the saturation magnetization, with respect to pure samples.