Magnetic Properties of (Ce,Sm)Fe<sub>11</sub>Ti Magnets

CeFe11Ti melt-spun ribbon with the ThMn12 phase was produced by annealing of the rapidly quenched specimen, but the resultant specimen contained some α-Fe phase and showed a coercivity of less than 0.1 MAm−1, below the expected coercivity value for permanent magnets. The coercivity of the CeFe11Ti melt-spun ribbon was improved by Sm substitution. The optimally annealed (Ce,Sm)Fe11Ti melt-spun ribbons exhibited a relatively high coercivity, although these specimens contained α-Fe phase together with the ThMn12 phase. The coercivity and Curie temperature of the annealed (Ce,Sm)Fe11Ti melt-spun ribbons increased with increasing the Sm content. The optimally annealed SmFe11Ti melt-spun ribbon showed a high coercivity of 0.40 MAm−1 when annealed at 1073 K.