Abstract
Abstract The metallurgical and physical nature of rare-earth magnets is reviewed. Their growing technological is discussed and the economic situation regarding materials supply and cost is considered. Different types of magnets are distinguished by composition, preparation method and origin of magnetic hardness. Differences in the magnetization reversal behavior are explained. Production methods for the various R-Co magnet types are outlined. Permanent magnet properties of interest to the device designer are given and the aging problem is discussed. Data for variour physical properties are also listed. An outlook into the future includes a discussion of the 2–17 magnets now being actively developed. Several promising avenues for further improvements of R-Co magnets are outlined and supportive metallurgical and physical research is suggested.
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