The main raw materials of sintered ferrite (Sintered Ferrite) include BaFe12O19 and SrFe12O19, which are divided into isotropic and anisotropic magnets according to the orientation of the magnetic crystals. Because of its low price and moderate magnetic properties, it has become a widely used magnet. Ferrite magnets are made by ceramic technology. They are relatively hard and brittle materials. Because of their good temperature resistance and low price, ferrite magnets have become the most widely used permanent magnets.