Samarium cobalt magnets are not as powerful as super-strong neodymium magnets but they do have some significant advantages. Samarium cobalt magnets work over a wider temperature range, have superior temperature coefficients and have much greater corrosion resistance. Samarium cobalt magnets certainly come into their own at high operating temperatures and will begin to outperform special high-temperature neodymium magnets from 150oC. However, regular neodymium magnets have a maximum operating temperature of 80oC.
Samarium cobalt magnets do not just excel at high temperatures, they maintain their magnetic properties even at temperatures below absolute zero (-273 oC) making them popular for cryogenic applications.
As most grades of samarium cobalt contain little or no iron, this gives them an excellent resistance to corrosion whereas neodymium magnets typically contain 60-75% iron. Samarium cobalt magnets, like neodymium magnets, provide a lot of magnetic strength (although not as much as neodymium magnets) when compared to their size and because they are rare-earth magnets they have an extremely high-resistance to demagnetisation from external magnetic fields.
These characteristics make samarium cobalt suitable for applications for the marine, automotive, aerospace, military and manufacturing industries including applications such as: