Effect of the substitution of Co for Fe on the magnetic properties of Nd2Fe14C-type ribbons with the high coercivity

Abstract Nd2Fe14C-type ribbons with a high coercivity of more than 2.5 T have been prepared directly by melt spinning. A study of the influence of Co substitution on the phase components and magnetic properties of Nd13Dy2Fe77−xCoxC6B2 (x=0–20) ribbons has been performed. It is verified that all the ribbons mainly consist of a single 2:14:1 phase. Magnetic measurement results show that Co substitution obviously improves the magnetic properties of the samples and the Curie temperature of the 2:14:1 phases. The remanence and maximum energy product are increased from 0.66 T and 76.4 kJ/m3 for x=0 to 0.73 and 93.1 kJ/m3 for x=10, respectively. The Curie temperature of the 2:14:1 phase in the ribbons increases with increasing x at an average rate of 11 K per atom Co.