Magnetization process of nanocrystalline mischmetal Fe B ribbons
Abstract Mischmetal Fe B ribbons were prepared by melt spinning method, and industrial mischetal with low purity was selected as the raw material. By introducing La and employing nonequilibrium technology, we successfully avoid the formation of CeFe 2 phase, which decreases magnetic performance greatly. Considerable energy product and intrinsic coercivity were achieved in (MM) 2.4 Fe 14 B, which are 80.69 kJ/m 3 and 500 kA/m, respectively. Phase composition and magnetization process of all the samples were investigated. Strong pinning effect was found in all rare earth rich samples and was identified as a crucial factor to obtain high coercivity in ribbons compared with the sintered magnets. The Henkel plot is also measured to investigate the intergrain interaction and the results show a strong exchange coupling between grains. Based on these results, the difference in magnetic performance between nanocrystalline ribbons and sintered magnets can be explained.