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

doi:10.1088/1674-1056/ac280a

中国物理B ›› 2022, Vol. 31 ›› Issue (4): 46301-046301.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

收稿日期:2021-06-30 修回日期:2021-09-06 接受日期:2021-09-18 出版日期:2022-03-16 发布日期:2022-03-10
通讯作者: Yaocen Wang, Yan Zhang, Chongde Cao E-mail:wangyc@nwpu.edu.cn;yzhang@nimte.ac.cn;caocd@nwpu.edu.cn
基金资助:
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.

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

Received:2021-06-30 Revised:2021-09-06 Accepted:2021-09-18 Online:2022-03-16 Published:2022-03-10
Contact: Yaocen Wang, Yan Zhang, Chongde Cao E-mail:wangyc@nwpu.edu.cn;yzhang@nimte.ac.cn;caocd@nwpu.edu.cn
Supported by:
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.

摘要/Abstract

摘要： L1₀-FeNi hard magnetic alloy with coercivity reaching 861 Oe was synthesized through annealing Fe₄₂Ni_41.3Si₈B₄P₄Cu_0.7 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.

关键词: L1₀-FeNi, hard magnetic materials, amorphous alloys, ab initio simulation

Abstract: L1₀-FeNi hard magnetic alloy with coercivity reaching 861 Oe was synthesized through annealing Fe₄₂Ni_41.3Si₈B₄P₄Cu_0.7 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.

Key words: L1₀-FeNi, hard magnetic materials, amorphous alloys, ab initio simulation

中图分类号: (Glasses and amorphous solids)

63.50.Lm

67.80.dk (Magnetic properties, phases, and NMR) 75.30.Gw (Magnetic anisotropy)

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[J]. 中国物理B, 2022, 31(4): 46301-046301.

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

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

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