As the second-generation rare earth permanent magnet, samarium cobalt (SmCo) not only has a high magnetic energy product (14-32 MGOe) and reliable coercive force, but also exhibits good temperature characteristics in the rare earth permanent magnet series. Compared with NdFeB, samarium cobalt is more suitable for working in high temperature environment, and has strong corrosion resistance and oxidation resistance; so it is widely used in aerospace, defense military, microwave devices,communication, medical equipment, instruments, Instruments, various magnetic transmissions, sensors, magnetic processors, motors, magnetic cranes, etc.