A nanocrystalline Sm–Co compound for high-temperature permanent magnets

Abstract

The inherently high magnetic anisotropy and nanoscale grain size in a Sm₅Co₁₉ compound result in an intrinsic coercivity far higher than those of known Sm–Co compounds prior to orientation treatment. The combination of ultrahigh intrinsic coercivity, high Curie temperature and low coercivity temperature coefficient of nanocrystalline Sm₅Co₁₉ as a single phase material shows it to be a very promising compound to develop outstanding high-temperature permanent magnets.