LAUSR

Nd2Fe14B have attracted intensive attentions due to its excellent magnetic properties since 1980s. However, large demands for the expensive rare earth (mainly refers to Nd/Pr/Dy) limit its wider applications. Investigations of Ce-doped Nd2Fe14B have been attempted recently and multi-main-phase (MMP) (Nd, Ce)2Fe14B provides a promising way for the preparation of high-performance Ce-doped permanent magnets even through the inner mechanism has not been absolutely understood. We synthesized Ce-doped Nd2Fe14B nanostructures by chemical method, and successfully realized the obvious properties enhancement of the MMP sample compared with single-main-phase (SMP) one. The coercivity of the MMP nanostructures is nearly 4.5 kOe with a remanence ratio of 0.36 before magnetic orientation, much larger than that of the SMP sample (1.7 kOe and 0.21), respectively. The properties enhancement mechanism of the MMP sample analyzed mainly by first-order reversal curves (FORCs) could be concluded as three aspects: Firstly, the content of α-Fe will be decreased hence the difficulty of the magnetic nucleation is increased. Secondly, the exchange coupling effect between the adjacent magnetic structures will be strengthened significantly. Lastly, the grain boundary phases with various magnetic features are formed, enhancing the magnetic pinning effect and specially tuning the inner interactions. This work is helpful for the deeper understanding of the property enhancement mechanism in MMP nanomagnets, and provides an instructive way for the effective design and preparation of high-performance MMP Ce-doped Nd2Fe14B nanomagnets.