Profile: Supra Magnets Inc. is a supplier of NdFeB magnets, ferrite magnets, AlNiCo magnets, SmCo magnets for magnetic sensors, Hall sensors, AMR sensors, GMR sensors, and TMR sensors. Alnico alloys make strong permanent magnets, and can be magnetized to produce strong magnetic fields. 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). They are the only magnets that have useful magnetism even when heated red-hot. This property, as well as its brittleness & high melting point, are the result of the strong tendency toward order due to intermetallic bonding between aluminum and its other constituents. They are also one of the most stable magnets if handled properly. Alnico magnets are electrically conductive, unlike ceramic magnets.