SmCo magnets:
Sintered Samarium Cobalt Magnets, available the designer a tremendous combination of extremely high magnetic properties, outstanding thermal stability and excellent corrosion resistance. These Characters make SmCo the ideal material in applications like servo-motors, pump couplings, and sensors, particularly where the magnet is required to operate at high temperature, across a broad temperature range of in a corrosive environment. 
with high quality , smco magnets are used widely for motor,meter, for detector.