Preparation of nanocrystalline Ce1−xSmx(Fe,Co)11Ti by melt spinning and mechanical alloying

Abstract Permanent magnetic materials based on Ce(Fe, Co) 12−x Ti x with the ThMn 12 structure are promising candidates for replacing NdFeB magnets. Its intrinsic magnetic properties are not far below the values of Nd 2 Fe 14 B, and the high amount of Fe and the fact that Ce is much more abundant and less expensive than Nd encourages the reasonable interest in these compounds. Nanocrystalline magnetic material of the composition Ce 1−x Sm x Fe 11−y Co y Ti (x=0−1 and y=0; 1.95) has been produced by both melt spinning and mechanical alloying. Alloys containing only Ce as rare earth element (x=0) show coercivities below 77 kA/m, while for x=1 H c,J values up to 392 kA/m are reached. Coercivity shows rather an exponential than a linear dependence on the gradual substitution of Ce by Sm.