Temperature is very important for magnet working.

Different kinds of magnets have different max working temperature.

Neodymium magnets have 80°C-220°C working temperature for different grades.            

For example N35 grade,the working temperature should be less than 80°C.For 38AH grade,it should be less than 220°C.

The higher temperature magnets work at. the higher prices they have.

For example.35SH grade of neo magnets are more expensive than N35 grade with the same dimensions.

AlNiCo magnets have highest temperature 550°C.Commonly AlNiCo magnets are applied for aerospace such as rockets and satellites.