What are SmCo magnets?

Samarium Cobalt (SmCo) magnet, is a type of rare earth magnet, is a strong permanent magnet made of an alloy of samarium and cobalt. SmCo magnets are often used in high temperature applications needing high magnetic performance and where magnetic stability over a wide range of temperatures is important.

SmCo magnets were developed in the early 1970s by Albert Gale and Dilip K. Das of Raytheon Corporation. They are generally ranked similarly in strength to neodymium magnets but have higher temperature ratings and higher coercivity.