There are essentially two classes or Rare Earth magnets. In the 1970's, samarium - cobalt magnets were discovered and produced in the U.S.A., Europe and Japan.  These magnets were quite expensive because of the raw material costs for samarium and for cobalt.
The energy products were quite high, 12 to 25 MGOe, and the maximum operating temperatures in the range of 250 degrees F to 350 degrees F depending on the grades. 
In the 1980's, the less expensive Rare Earth magnets were discovered.  They are similar to samarium cobalt magnets in processing and magnetic characteristics. But, compared to samarium cobalt, they have higher magnetic energies, 27 to 40 MGOe, but lower operating temperatures of 200-275 degrees F. They are relatively less expensive because of lower raw material costs. Rare Earth magnets are produced by a select group of licensees, from Magnequench Corporation in the U.S.A. and Sumitomo Corporation in Japan. The magnet stock is purchased from one of the licensees, followed by secondary machining and magnetizing operations where needed and supplied to customer's specifications.

Polymag has certain unique capabilities in select secondary operations and can be competitive in supplying samarium cobalt, and rare earth magnets.