Structural Transformation and Magnetic Properties of Sm–Fe Alloys with V Doping

A systematical investigation was carried out on structure and magnetic properties in SmFe 9-x V x （x=0.4,0.8,1.2） compounds prepared by a single-roller quenching method. The high cool-down rate leads to metastable TbCu 7 phase in the parent compound,which gradually transforms into equilibrium ThMn 12 structure with V-doping content increasing.The Curie temperature increases from 470 to590 K with V doping,which is consistent with the phase transformation.Surprisingly,simultaneous increase in both coercivity and remanence is resulted by V doping,reaching the highest value of 685 kA·m -1 and 44.8 × 10 -3 A·m~2·g -1 in x=1.2 compound,respectively.This phenomenon can be explained by the combination of phase transformation and intergranular exchange coupling through δM-H plots.