Microstructure dependence of the magnetic properties of nanocomposed magnets

The grain size effect on the magnetic properties of nanocrystalline, two-ph ase Nd2Fe14B/Fe3B powder mixtures has been studied. Each of the two phases was prepared by mechanical alloying and heat treatment. The remanence incre ases and the coercive field decreases with increasing weight fraction of th e soft magnetic phase. The coercivity decreases and remanence increases wit h increasing grain size of the soft magnetic phase. The results provide arg uments that the concentration and grain size of the soft magnetic phase pla ys a decisive role in the magnetic properties of nanocomposite magnets. (C) 1999 Elsevier Science S.A. All rights reserved.