中国物理B ›› 2015, Vol. 24 ›› Issue (7): 77103-077103.doi: 10.1088/1674-1056/24/7/077103

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Enhanced coercivity and remanence of PrCo5 nanoflakes prepared by surfactant-assisted ball milling with heat-treated starting powder

左文亮, 赵鑫, 熊杰夫, 商荣翔, 章明, 胡凤霞, 孙继荣, 沈保根   

  1. State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2015-03-03 修回日期:2015-03-30 出版日期:2015-07-05 发布日期:2015-07-05
  • 基金资助:

    Project supported by the National Basic Research Program of China (Grant No. 2014CB643702), the National Natural Science Foundation of China (Grant No. 51401235), and Beijing Natural Science Foundation, China (Grant No. 2152034).

Enhanced coercivity and remanence of PrCo5 nanoflakes prepared by surfactant-assisted ball milling with heat-treated starting powder

Zuo Wen-Liang (左文亮), Zhao Xin (赵鑫), Xiong Jie-Fu (熊杰夫), Shang Rong-Xiang (商荣翔), Zhang Ming (章明), Hu Feng-Xia (胡凤霞), Sun Ji-Rong (孙继荣), Shen Bao-Gen (沈保根)   

  1. State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2015-03-03 Revised:2015-03-30 Online:2015-07-05 Published:2015-07-05
  • Contact: Zuo Wen-Liang, Shen Bao-Gen E-mail:wlzuo@iphy.ac.cn;shenbg@aphy.iphy.ac.cn
  • Supported by:

    Project supported by the National Basic Research Program of China (Grant No. 2014CB643702), the National Natural Science Foundation of China (Grant No. 51401235), and Beijing Natural Science Foundation, China (Grant No. 2152034).

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摘要：

PrCo5 nanoflakes with strong texture and high coercivity of 8.15 kOe were prepared by surfactant-assisted ball milling with heat-treated starting powder. The thickness and length of the as-milled nanoflakes are mainly in the ranges of 50–100 nm and 0.5–3 μm, respectively. The x-ray diffraction patterns demonstrate that the heat treatment can increase the single phase and crystallinity of the PrCo5 compound, and combined with the demagnetization curves, indicate that the single phase and crystallinity are important for preparing high-coercivity and strong-textured rare earth permanent magnetic nanoflakes. In addition, the coercivity mechanism of the as-milled PrCo5 nanoflakes is studied by the angle dependence of coercivity for an aligned sample and the field dependence of coercivity, isothermal (IRM) and dc demagnetizing (DCD) remanence curves for an unaligned sample. The results indicate that the coercivity is dominated by co-existing mechanisms of pinning and nucleation. Furthermore, exchange coupling and dipolar coupling also co-exist in the sample.

关键词: coercivity mechanism, textured PrCo5 nanoflakes, surfactant-assisted ball milling, heat treatment

Abstract:

PrCo5 nanoflakes with strong texture and high coercivity of 8.15 kOe were prepared by surfactant-assisted ball milling with heat-treated starting powder. The thickness and length of the as-milled nanoflakes are mainly in the ranges of 50–100 nm and 0.5–3 μm, respectively. The x-ray diffraction patterns demonstrate that the heat treatment can increase the single phase and crystallinity of the PrCo5 compound, and combined with the demagnetization curves, indicate that the single phase and crystallinity are important for preparing high-coercivity and strong-textured rare earth permanent magnetic nanoflakes. In addition, the coercivity mechanism of the as-milled PrCo5 nanoflakes is studied by the angle dependence of coercivity for an aligned sample and the field dependence of coercivity, isothermal (IRM) and dc demagnetizing (DCD) remanence curves for an unaligned sample. The results indicate that the coercivity is dominated by co-existing mechanisms of pinning and nucleation. Furthermore, exchange coupling and dipolar coupling also co-exist in the sample.

Key words: coercivity mechanism, textured PrCo5 nanoflakes, surfactant-assisted ball milling, heat treatment

中图分类号:  (Rare earth metals and alloys)

  • 71.20.Eh
75.75.Cd (Fabrication of magnetic nanostructures) 75.30.Gw (Magnetic anisotropy) 75.60.Jk (Magnetization reversal mechanisms)