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Controllable Nd₂Fe₁₄B/α-Fe nanocomposites: chemical synthesis and magnetic properties
Lianqing Yu1, Ce Yang, Yanglong Hou
1Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China. hou@pku.edu.cn.
Abstract:
It is extremely desirable but challenging to develop exchange-coupled magnets with well-dispersed hard/soft phase and confined size to meet the high energy requirements of advanced magnets in modern industry and information technology. Here, we report a novel bottom-up strategy with two-step thermal decomposition and reductive annealing process to synthesize Nd₂Fe₁₄B/α-Fe nanocomposites, in which effective control of the hard/soft magnetic phase size and proportion was achieved. It is worth noting that the composition, as well as phase distribution, can be readily tuned by changing the ratio between Nd-Fe-B-oxide and α-Fe. This work provides an effective approach to adjust the phase size and distribution for exchange-coupled, rare-earth nanomagnets, which can be fundamental for high energy magnets.
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