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SAMARIUM COBALT MAGNETS
Samarium cobalt magnets (SmCo) are composed of samarium, cobalt and iron. These rare earth magnets are extremely strong for their small size, metallic in appearance and found in simple shapes such as rings, blocks and discs.

Applications of Samarium Cobalt Magnets:

•Computer disc drives
•Sensors
•Radar
•Traveling wave tubes
•Satellite systems
•Motors where temporary stability is vital Attributes of Samarium Cobalt Material
•High resistance to demagnetization
•High Energy Product
•Good temperature stability
•High resistance of corrosion and oxidation
•Expensive material (cobalt is market price sensitive)

details:http://www.china-magnet.net/smco.html