These Samarium Cobalt magnet (Sm2Co17) alloys are an age hardening type with a composition of two atoms of rare earth Samarium Cobalt and 13-17 atoms of transition metals (TM). The TM content is rich in cobalt, but contains other elements such as iron and copper.

These samarium cobalt magnet (smco5 magnets) alloys have one atom of rare earth Samarium and five atoms of Cobalt. By weight this samarium cobalt magnet alloy will typically contain 36% Samarium with the balance Cobalt.

Samarium cobalt magnets (SmCo) are composed of samarium, cobalt
and iron. These rare earth magnets are extremely strong for
their small size, metallic in appearance and found in simple
shapes such as rings, blocks and discs.