Influence of ZnFe2O4 substitution on the microstructural and magnetic properties of M-type Sr0.1Ca0.4La0.5Fe12O19 hexagonal ferrites

The M-type ferrite Sr0.1Ca0.4La0.5Fe12O19 magnetic powders with different ZnFe2O4 substitution amounts (Rm, 0, 1%, 3%, 5%, 7%, and 9%) were obtained using a ceramic process. The structure of specimens were examined by using an X-ray diffractometer. All the specimens exhibited a typical single-phase hexagonal M-type structure, and the particles in specimens were uniformly distributed in size. The VSM study indicated the specimen with Rm=9% had the maximum saturation magnetization of 70.22 emu/g, and the residual magnetization and the coercivity of specimens increased firstly and decreased later with the increase of Rm. The specimen with Rm=3% exhibits the best comprehensive magnetic properties.