High coercivity Nd-Ce-Fe-B nanostructured ribbons prepared from melt spinning technique

Liang Zha¹，Zhou Liu¹，Hao Chen²，Mingzhu Xue¹，Guanyi Qiao¹，Shilei Ding¹，Xin Wen¹，Meiling Zhang³，Youfang Lai¹，Wenyun Yang¹，Jingzhi Han¹，Dong Zhou⁴，Chenyao Zhu⁵，Jinbo Yang^5,6

1. State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University2. Institute of International Economy, University of International Business and Economics3. Functional Materials Research Institute, Central Iron & Steel Research Institute4. Collaborative Innovation Center of Quantum Matter5. Robotics Research Group, College of Engineering, Peking University6. Beijing Key Laboratory for Magnetoelectric Materials and Devices

摘 要：The Ce-substituted(Nd_1-xCe_x)_12.2 Fe_81.6 B_6.2（x=0.0, 0.2, 0.4, 0.6） nanocrystalline ribbons were prepared by annealing amorphous ribbons from melt spinning. It is found that all ribbons are in a multiphase state consisting of a-Fe phase, Nd（Ce）-rich phases and RE₂ Fe₁₄ B（RE = Nd, Ce） phases. However, the coercivity of all annealed ribbons can reach a considerably high value without doping any heavy rare earth or other coercivity enhanced elements. A strong intergranular exchange coupling appears in these nanocrystalline ribbons. The Nd_12.2 Fe_81.6 B_6.2 ribbons with multiphase have a coercivity of about 11.3 k Oe, and the coercivity decreases slightly with increasing Ce content. A coercivity of 7.5 kOe can be obtained when60 at% of Nd is replaced by Ce（x = 0.6） due to the grain refinement and the strong intergranular exchange coupling. This provides a practical approach of fabricating high coercivity Ce-substituted Nd-Fe-B materials.

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