Ferrite magnet is a kind of permanent magnet mainly made of SrO or Bao and Fe2O3. It is a functional material made by ceramic process, with wide hysteresis loop, high coercivity and high remanence. Once magnetized, it can maintain constant magnetism, and the device density is 4.8g/cm3. Compared with other permanent magnets, ferrite magnets are hard and brittle with low magnetic energy. However, it is not easy to demagnetize and corrode, the production process is simple and the price is low. Therefore, ferrite magnets have the highest output in the whole magnet industry and are widely used in industrial production.