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Samarium-cobalt magnet (SmCo)
Arnold Magnetic Technologies

Sintered samarium cobalt (SmCo) magnets, available since the early 1970's, offer the designer a tremendous combination of extremely high magnetic properties, outstanding thermal stability and excellent corrosion resistance. These characteristics make SmCo the ideal material in applications such as servo-motors, pump couplings, and sensors, particularly where the magnet is required to operate at high temperatures, across a broad temperature range or in a corrosive environment.

The first alloy composition was SmCo5 with maximum energy products of about 18 MGOe (140 kJ/m3). Shortly after this development, an additional alloy composition, Sm2Co17 was developed by Karl Strnat. This was developed over time to provide over 30 MGOe (240 kJ/m3). Although processing of the 2-17 composition is more difficult, it also has the advantage of generally containing less Cobalt than the 1-5 composition. 2-17 is also corrosion resistant and more stable at very high temperatures. Both types are manufactured by Arnold Magnetic Technologies AG to satisfy specific customer needs. Arnold's brand name of samarium cobalt is Recoma™.