中国物理B ›› 2015, Vol. 24 ›› Issue (8): 87501-087501.doi: 10.1088/1674-1056/24/8/087501

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

Evolution of structure and magnetic properties in PrCo5 magnet for high energy ball milling in ethanol

李柱柏a, 兰剑亭a b, 张雪峰a b, 刘艳丽a b, 李永峰a b   

  1. a Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;
    b School of Mathematics, Physics and Biological Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China
  • 收稿日期:2015-01-20 修回日期:2015-03-08 出版日期:2015-08-05 发布日期:2015-08-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51461033).

Evolution of structure and magnetic properties in PrCo5 magnet for high energy ball milling in ethanol

Li Zhu-Bai (李柱柏)a, Lan Jian-Ting (兰剑亭)a b, Zhang Xue-Feng (张雪峰)a b, Liu Yan-Li (刘艳丽)a b, Li Yong-Feng (李永峰)a b   

  1. a Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;
    b School of Mathematics, Physics and Biological Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China
  • Received:2015-01-20 Revised:2015-03-08 Online:2015-08-05 Published:2015-08-05
  • Contact: Zhang Xue-Feng E-mail:xuefeng056@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51461033).

摘要: High energy ball milling (HEBM) is employed to produce nano-sized grains and particles. In this paper, the structure and magnetic properties are investigated in PrCo5 alloy for HEBM in an ethanol milling medium. With the increase of milling time, the grain size reduces and the coercivity increases. For a milling time of less than 30 min, the hysteresis loop of the aligned sample is very different from that of the un-aligned sample and it does not show a large decrease in magnetization slope, indicating a relatively good alignment of easy axes in particles due to the fact that the texture is nearly well preserved. However, when the milling time is further prolonged, the textured structure deteriorates in the powders. Even though exchange coupling exists between grains within the particle, the magnetic properties are exchange-decoupled between particles and the dipolar interaction results in a negative value of δ m in the whole range of the magnetic field.

关键词: high energy ball milling, PrCo5 magnets, alignment of easy axes, exchange coupling

Abstract: High energy ball milling (HEBM) is employed to produce nano-sized grains and particles. In this paper, the structure and magnetic properties are investigated in PrCo5 alloy for HEBM in an ethanol milling medium. With the increase of milling time, the grain size reduces and the coercivity increases. For a milling time of less than 30 min, the hysteresis loop of the aligned sample is very different from that of the un-aligned sample and it does not show a large decrease in magnetization slope, indicating a relatively good alignment of easy axes in particles due to the fact that the texture is nearly well preserved. However, when the milling time is further prolonged, the textured structure deteriorates in the powders. Even though exchange coupling exists between grains within the particle, the magnetic properties are exchange-decoupled between particles and the dipolar interaction results in a negative value of δ m in the whole range of the magnetic field.

Key words: high energy ball milling, PrCo5 magnets, alignment of easy axes, exchange coupling

中图分类号:  (High coercivity materials)

  • 75.50.Vv
75.50.Ww (Permanent magnets) 75.50.Tt (Fine-particle systems; nanocrystalline materials)