“…By Ga addition and an appropriate annealing in pulse magnetic field of melt-spun Nd 2 Fe 14 B/␣-Fe nanocomposite, Zhang et al obtained a refinement of microstructure and an increase of the magnetic properties [17]. Other researches present some improvement of magnetic properties by Co, Zr [18] or Nb [19] substitutions. In rapidly quenched Nd-Fe-B ribbons, Hirosawa et al [20] studied the influence of the cooling rate and of the substitution elements, such as Cr and Cu, on the Fe 3 B/Nd 2 Fe 14 B formation during rapid solidification.…”