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Effect of spin-reorientation transition of cell boundary phases on the temperature dependence of magnetization and coercivity in Sm2Co17 magnets |
| Si-Si Tu(涂思思)1,2, Lei Liu(刘雷)2,†, Bo Zhou(周波)2, Chuang-Hui Dong(董创辉)2, Li-Ming Ye(叶力铭)2, Ying-Li Sun(孙颖莉)2, Yong Ding(丁勇)2,‡, A-Ru Yan(闫阿儒)2, and Xin-Biao Mao(毛信表)1 |
1 College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
2 CISRI and NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China |
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Abstract Four Sm2Co17 magnets with spin-reorientation transition (SRT) of cell boundary phases (CBPs) are prepared by liquid-phase sintering. The temperature of the SRT of CBPs (TSR1:5) is regulated from 125 K to 195 K by adding 0 wt.%, 3 wt.%, 6 wt.% and 9 wt.% Dy88Cu12 alloy powder. The effect of SRT of Sm2Co17 magnet CBPs on the temperature dependence of the magnetization (M-T) and coercivity (H-T) is systematically investigated. The temperature dependence of the magnetization is influenced by the SRT of CBPs. The M-T curves measured during the heating process are larger than those measured during the cooling process when T < TSR1:5. When T = TSR1:5 there is a bifurcation point. When T>TSR1:5 the M-T curves overlap and the M-T derivation curve shows that the magnetization of the magnet has low temperature dependence of magnetization above TSR1:5. With increasing TSR1:5, the initial temperature of the low temperature dependence of magnetization shifts towards a higher temperature. The coercivity temperature coefficient becomes positive as the SRT effect increases, and the temperature range of the positive coercivity temperature coefficient moves towards higher temperatures as TSR1:5 increases. This reveals that SRT of CBPs has little effect on the temperature dependence of magnetization above TSR1:5, while the temperature dependence of coercivity is optimized. The temperature range of magnetization and coercivity with low temperature dependence tends towards higher temperatures, which is conducive to the preparation of magnets with a low temperature coefficient at higher temperatures.
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Received: 21 February 2023
Revised: 23 March 2023
Accepted manuscript online: 28 March 2023
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PACS:
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75.30.Gw
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(Magnetic anisotropy)
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68.60.Dv
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(Thermal stability; thermal effects)
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71.20.Eh
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(Rare earth metals and alloys)
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75.50.Ww
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(Permanent magnets)
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| Fund: Project supported by the National Key R&D Program of China (Grant Nos.2021YFB3803003 and 2021YFB3503101), Youth Innovation Promotion Association of CAS (Grant No.2023311), Major Project of 'Science and Technology Innovation 2025' in Ningbo (Grant No.2020Z044), and Zhejiang Provincial Key Research and Development Program(Grant No.2021C01172). |
Corresponding Authors:
Lei Liu, Yong Ding
E-mail: liulei@nimte.ac.cn;dingyong@nimte.ac.cn
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Cite this article:
Si-Si Tu(涂思思), Lei Liu(刘雷), Bo Zhou(周波), Chuang-Hui Dong(董创辉), Li-Ming Ye(叶力铭), Ying-Li Sun(孙颖莉), Yong Ding(丁勇), A-Ru Yan(闫阿儒), and Xin-Biao Mao(毛信表) Effect of spin-reorientation transition of cell boundary phases on the temperature dependence of magnetization and coercivity in Sm2Co17 magnets 2023 Chin. Phys. B 32 127501
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