Synthesis and magnetic properties of Fe-B-Nd-Nb nanocomposite magnets

Magnetic properties of Fe-B-Nd-Nb quaternary alloys were investigated in terms of the Fe concentration and the quenching rate. High energy products reaching 98 kJ/m3 with high coercivities of 570-750 kA/m were obtained by a conventional rapid quenching technique followed by heat treatment. The nanocomposite magnets are attractive for future applications since their magnetic performance can be improved by optimization of the quenching rate and the heat treatment condition.