MECHANICALLY ALLOYED HARD MAGNETIC-MATERIALS

Recent developments in the synthesis of hard magnetic materials by mec hanical alloying are reviewed. In rare earth-transition metal compound s the nanocrystalline structure developed by mechanical alloying and h eat treatment results in ultra-high coercivity and isotropic behaviour associated with random grain alignment. Mechanically alloyed two phas e exchange-coupled materials exhibit remanence enhancement, and the re versible and irreversible magnetisation behaviour of this novel class of permanent magnet is also discussed.