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Chin. Phys. B, 2022, Vol. 31(4): 046301    DOI: 10.1088/1674-1056/ac280a

Formation of L10-FeNi hard magnetic material from FeNi-based amorphous alloys

Yaocen Wang(汪姚岑)1,2,†, Ziyan Hao(郝梓焱)1,2, Yan Zhang(张岩)3,‡, Xiaoyu Liang(梁晓宇)4, Xiaojun Bai(白晓军)1, and Chongde Cao(曹崇德)1,2,§
1 School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China;
2 Innovation Center of Northwestern Polytechnical University in Chongqing, Chongqing 401135, China;
3 Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
4 Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
Abstract  L10-FeNi hard magnetic alloy with coercivity reaching 861 Oe was synthesized through annealing Fe42Ni41.3Si8B4P4Cu0.7 amorphous alloy, and the L10-FeNi formation mechanism has been studied. It is found the L10-FeNi in annealed samples at 400 ℃ mainly originated from the residual amorphous phase during the second stage of crystallization which could take place over 60 ℃ lower than the measured onset temperature of the second stage with a 5 ℃/min heating rate. Annealing at 400 ℃ after fully crystallization still caused a slight increase of coercivity, which was probably contributed by the limited transformation from other high temperature crystalline phases towards L10 phase, or the removal of B from L10 lattice and improvement of the ordering quality of L10 phase due to the reduced temperature from 520 ℃ to 400 ℃. The first stage of crystallization has hardly direct contribution to L10-FeNi formation. Ab initio simulations show that the addition of Si or Co in L10-FeNi has the effect of enhancing the thermal stability of L10 phase without seriously deteriorating its magnetic hardness. The non-monotonic feature of direction dependent coercivity in ribbon segments resulted from the combination of domain wall pinning and demagnetization effects. The approaches of synthesizing L10-FeNi magnets by adding Si or Co and decreasing the onset crystallization temperature have been discussed in detail.
Keywords:  L10-FeNi      hard magnetic materials      amorphous alloys      ab initio simulation  
Received:  30 June 2021      Revised:  06 September 2021      Accepted manuscript online:  18 September 2021
PACS:  63.50.Lm (Glasses and amorphous solids) (Magnetic properties, phases, and NMR)  
  75.30.Gw (Magnetic anisotropy)  
Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 51971179 and 51971180), the Natural Science Foundation of Chongqing, China (Grant No. cstc2019jcyj-msxmX0328), Shaanxi Provincial Natural Science Foundation, China (Grant No. 2020JM-112), Guangdong Provincial Science and Technology Program, China (Grant No. 2019B090905009), the Fundamental Research Funds for the Central Universities of China (Grant No. D5000210731), and Shaanxi Provincial Key R&D Program, China (Grant No. 2021KWZ-13). The computational work was performed on supercomputing system in Institute for Materials Research, Tohoku University.
Corresponding Authors:  Yaocen Wang, Yan Zhang, Chongde Cao     E-mail:;;

Cite this article: 

Yaocen Wang(汪姚岑), Ziyan Hao(郝梓焱), Yan Zhang(张岩), Xiaoyu Liang(梁晓宇), Xiaojun Bai(白晓军), and Chongde Cao(曹崇德) Formation of L10-FeNi hard magnetic material from FeNi-based amorphous alloys 2022 Chin. Phys. B 31 046301

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