SmCo Disc Magnet Ø25x5mm +350°C Pull Force 5,4kg

Samarium–Cobalt magnets can be used at temperatures of up to 350°C and have better corrosion stability than Neodymium magnets. They are quite resistant to external magnetic fields and do not need to be protected against corrosion.
Samarium–Cobalt magnets are slightly more expensive than Neodymium magnets due to the rarity of the materials and the difficulty of the manufacturing process.