The influence of fabrication conditions on structure and magnetic properties of Nd?Fe?Co?Nb?B nanocomposites

In this paper, we present the results of an investigation of the influence of fabrication conditions on the structure and magnetic properties of Nd10.5−xFe83.5−yCoxNbyB6 (x=0–6; y=1.5–3) nanocomposites prepared by melt-spinning combined with annealing. By changing the quenching rate (by varying the tangential velocity of the copper wheel from 10 m s−1 to 40 m s−1), one can select a suitable velocity to obtain an alloy that has good, hard magnetic behavior without annealing. However, the hard magnetic behavior of the alloy is better and more stable when the alloy is quenched at a high rate to create an amorphous state and subsequently annealed in the range of 650–800 °C for 10 min. The results also show that the Co concentration has an important effect on the structure and magnetic properties of the alloys.