About samarium cobalt magnets characteristics:

As the kind of rare-earth permanent magnet--Samarium Cobalt(the following called SmCo-magnet) is widely used second generation rare-earth magnetic material. SmCo magnet is made from cobalt and samarium and other rare-earth elements, is a high performance permanent magnet, it exhibits high magnetic performance characteristics in energy and coercive force. There are two compositions of magnets in this family: Sm1Co5 and Sm2Co17. The highest commercially available energy products of Sm2Co 17 are in the 30MGOe range. The 2:17(most popular) offers a better performance & lower temperature coefficient, however it is slightly more expensive and require very high magnetic field to magnetise it. SmCo-magnet has higher maximum working temperatures than neodymium, although its maximum strengh is less. Its biggest advantage is its high working temperature up to 300 degree centigrade. In the meantime, its higher corrosion and oxidation resistance are also crucial. So SmCo magnets usually need not be plated with other metal. The cost of SmCo material is the most expensive, so SmCo-magnet is recommended only when its performance is a high temperature environment concerned
         
       1. Possessing a unique combination of strong magnetic properties,good anti-corrosion ability and long thermal stability (up to 350'c), Samarium-Cobalt Magnet is ideal for use in devices like servomotors, sensor controls and other equipments which require magnetic properties to be functional at the continuous raised temperature or under easy corrosion circumstance. Samarium-Cobalt Magnet owns following advantages:
· possess strong magnetic properties - 5-7 times more powerful than ferrite
· very steady in the conditions capable to cause corrosion
· possess stable magnetic properties at high temperatures (to 350'c)
AMT&C can supply them in all shapes and sizes you might require

      2. SmCo is also named with SmCo magnetic steel, SmCo permanent magnet, SmCo permanent magnetic iron and rare-earth cobalt permanent magnet. It's a high performance, low temperature coefficient permanent magnet with its high working temperature—350 degree centigrade. When working above 180 degree centigrade, its maximum energy product BH and steady temperature are superior than NdFeB magnetic materials. It needn't to be coated because it is difficult to be eroded and oxidized. SmCo magnet is widely used in motors, watch, transducers, instruments, positional detector, generators, radar communications, medical equipments, various magnetism spreading devices, magnetic processor, electrical engineering and magnetic derrick


  Applications of SmCo Magnet
· Computer disc drives
· Sensors
· Radar
· Traveling wave tubes
· Satellite systems
· Motors where temporary stability is vital

Attributes of SmCo Magnet
· High resistance to demagnetization
· High Energy Product
· Good temperature stability
· High resistance of corrosion and oxidation
· Expensive material (cobalt is market price sensitive)