Samarium cobalt (SmCo) is a type of rare-earth magnet that has the ability to operate in high temperatures. Similarly to many other rare-earth magnets samarium cobalt is brittle and can be chipped and cracked easily making them unsuitable for applications that require repetitive direct impact to the surface of the magnet. Samarium cobalt disc magnets are often used in applications where the magnet is recessed into a hole or groove to protect the magnet from impact. They are typically found in food and industrial manufacturing industries.
While many other types of rare-earth permanent magnets have been discovered and made commercially available samarium cobalt is still the first choice magnet for adverse or high temperature environments.