Samarium cobalt magnets (Sm-Co) were the first magnets to use rare earths and have been commercialized in the 1960’s. Due to its high-performance magnetic properties, this type of magnet is still used in a large number of high-end applications. Their energy product can reach 33 MGOe (upon request for specific applications) and the magnets are highly resistant to corrosion, and therefore ideal for medical applications.
The SmCo magnets can be used up to 300°C and are relatively insensitive to demagnetization factors and therefore correspond perfectly to special engine applications. However, it is not recommended to use these magnets as a structural component in an assembly because these magnets tend to flake off.