Magnetic Properties of (Ce,Sm)Fe₁₁Ti Magnets

Abstract

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.

Fig. 4 Hysteresis curves of the Ce_1−xSm_xFe₁₁Ti (x = 0–1) specimens annealed at 1073 K.