Samarium cobalt (SmCo)
Depending on the ingredients include SmCo5 and Sm2Co17. Due to its material is expensive, but its development is restricted. Samarium cobalt (SmCo) as the rare-earth permanent-magnet iron, not only has a high energy product (14-28MGOe), coercivity of reliable and good temperature characteristics. Compare with neodymium-Iron-Boron magnets, samarium-cobalt magnets are more suitable for working in high temperature environments.