Optimizing composition for (Nd, Pr)-Nb-Fe-B hard magnetic nanocomposites

The influence of composition and annealing temperature on the magnetic properties of (Nd0.5Pr0.5)(6+x)Nb1.5Fe88.5-x-yB4+y (x = 0-6, y = 0-10) nanocomposites prepared via melt-spinning and subsequent annealing was investigated systematically to obtain their optimal compositions and fabrication conditions. The results show that each of the rare earth concentrations has an appropriate ratio of Fe/B to reveal the best performance of the material. The optimal annealing temperature decreases from 750 to 675 degrees C when concentration of rare earth is increased from 6 to 12 at.%. Coercivity, H-c, and maximum energy product, (BH)(max), of these nanocomposites can be regulated up to 14.5 kOe and 16 MGOe, respectively, by suitably choosing their composition.