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Chin. Phys. B, 2015, Vol. 24(7): 077103    DOI: 10.1088/1674-1056/24/7/077103

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

Zuo Wen-Liang, Zhao Xin, Xiong Jie-Fu, Shang Rong-Xiang, Zhang Ming, Hu Feng-Xia, Sun Ji-Rong, Shen Bao-Gen
State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

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.

Keywords:  coercivity mechanism      textured PrCo5 nanoflakes      surfactant-assisted ball milling      heat treatment  
Received:  03 March 2015      Revised:  30 March 2015      Published:  05 July 2015
PACS:  71.20.Eh (Rare earth metals and alloys)  
  75.75.Cd (Fabrication of magnetic nanostructures)  
  75.30.Gw (Magnetic anisotropy)  
  75.60.Jk (Magnetization reversal mechanisms)  

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).

Corresponding Authors:  Zuo Wen-Liang, Shen Bao-Gen     E-mail:;

Cite this article: 

Zuo Wen-Liang, Zhao Xin, Xiong Jie-Fu, Shang Rong-Xiang, Zhang Ming, Hu Feng-Xia, Sun Ji-Rong, Shen Bao-Gen Enhanced coercivity and remanence of PrCo5 nanoflakes prepared by surfactant-assisted ball milling with heat-treated starting powder 2015 Chin. Phys. B 24 077103

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