Praseodymium and neodymium-based nanocrystalline hard magnetic alloys

摘要

The magnetic properties of nanophase exhange enhanced RE-Fe-B based alloys ribbons prepared by melt spinning are presented and discussed. The alloy systems investigated include Nd_yFe_(94-y)B_6 and Pr_yFe_(94-y)B_6, for y within the range 6-20 atpercent, and the data are compared in the context of the larger anisotropy field for the Pr_2Fe_(14)B phase in comparison with Nd_2Fe_(14)B. Experimental studies are also reported for nanophase (Nd-Pr)-Fe-B alloys with various proportions of Nd:Pr, to investigate the increase in coercivity of NdFeB by partial substitution of Nd by Pr, and for (Nd, Pr)-(Fe-Co)-B-based systems, to study the degree to which the remanence enhancement can be maintained for alloys in which Co substitutes for Fe to increase the thermal stability.