Permanent magnetic material made of iron-rare earth metal alloy

摘要

An iron-rare earth metal permanent magnetic composition, comprising predominant phase having a body-centered tetragonal structure, and consisting essentially of an iron-based alloy having a composition represented by the formula: FeaRbMcNdBeCfCogNih wherein R represents at least one element selected from the group consisting of Y, Th and the lanthanide elements; M represents at least one element selected from the group consisting of Ti, Cr, V, Zr, Nb, Al, Mo, Mn, Hf, Ta, W, Mg, Si, Sn, Ge and Ga; the elements are present in atomic percentages indicated by a, b, c, d, e, f, g and h, wherein a+b+c+d+e+f+g+h=100 atomic %; and further, 3