Samarium-cobalt magnets / Raw magnets SmCo

Samarium-cobalt magnets belong with neodymium to the rare earths magnets. There are different SmCo magnets according to the following alloy types:
SmCo 5: 36% Samarium or Sm2Co17 25% Samarium, Iron up to 18% and copper up to 12%. 

Samarium-cobalt magnets resist to high temperatures but the max. operating temperature is 250°C (SmCo 5) and to 350°C (Sm2Co17). Their energy product is about 260 kJ7m³.
Samarium-cobalt magnets are quite resistant to external magnetic fields and need not be protected against corrosion.
Samarium-Cobalt magnets are a little more expensive than neodymium ones because of the rarity of the materials and because of the difficult manufacturing process.