Before the discovery of the neodymium magnet, the strongest permanent magnet was the samarium–cobalt magnet, which was based on the Sm 2 Co 17 intermetallic phase. However, samarium is expensive ...

These magnets are commonly used in electric motors, magnetron tubes, as well as turbine blades for gas turbines and jet aircraft engines. Cobalt is combined with the rare-earth element Samarium to ...