Alnico alloys have some of the highest Curie temperatures of any magnetic material , around 800 ° C ( 1,470 ° F ) , although the maximum working temperature is normally limited to around 538 ° C ( 1,000 ° F ) .
Alnico magnets have one of the highest Curie temperatures ( around 800 ° C ( 1,470 ° F ) ) .