中国物理B ›› 2009, Vol. 18 ›› Issue (6): 2582-2588.doi: 10.1088/1674-1056/18/6/077

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Simulation of magnetization behaviours of Sm(Co,Fe,Cu,Zr)z magnet with low Cu content

闫阿儒1, 陈仁杰2, 陈立东3, 张宏伟4, 沈保根4   

  1. (1)Ningbo Institute of Materials Technology { & Engineering, Chinese Academy of Sciences, Ningbo 315201, China; (2)Ningbo Institute of Materials Technology { & Engineering, Chinese Academy of Sciences, Ningbo 315201, China;Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; (3)Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; (4)State Key Laboratory of Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chi
  • 收稿日期:2008-09-17 修回日期:2008-11-28 出版日期:2009-06-20 发布日期:2009-06-20
  • 基金资助:
    Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant No Y407174).

Simulation of magnetization behaviours of Sm(Co,Fe,Cu,Zr)z magnet with low Cu content

Chen Ren-Jie(陈仁杰)a)c)†, Zhang Hong-Wei(张宏伟)b), Shen Bao-Gen(沈保根)b), Yan A-Ru(闫阿儒)a), and Chen Li-Dong(陈立东)c)   

  1. a Ningbo Institute of Materials Technology { & Engineering, Chinese Academy of Sciences, Ningbo 315201, China; b State Key Laboratory of Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China; c Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2008-09-17 Revised:2008-11-28 Online:2009-06-20 Published:2009-06-20
  • Supported by:
    Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant No Y407174).

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摘要： The effects of microstructure, cell orientation and temperature on magnetic properties and the coercivity mechanism in Sm(Co,Fe,Cu,Zr)z with low Cu content are studied by using the micromagnetic finite element method in this paper. The simulations of the demagnetization behaviours indicate that the pinning effect weakens gradually with the thickness of cell boundary decreasing and strengthens gradually with the cell size decreasing. Because of the intergrain exchange coupling, the coercivity mechanism is determined by the difference in magnetocrystalline anisotropy between the cell phase and the cell boundary phase. And the coercivity mechanism is related to not only the cells alignment but also temperature. With temperature increasing, a transformation of the demagnetization mechanism occurs from the domain pinning to the uniform magnetization reversal mode and the transformation temperature is about 650~K.

关键词: micromagnetic finite element method, microstructure, cell orientation, temperature

Abstract: The effects of microstructure, cell orientation and temperature on magnetic properties and the coercivity mechanism in Sm(Co,Fe,Cu,Zr)z with low Cu content are studied by using the micromagnetic finite element method in this paper. The simulations of the demagnetization behaviours indicate that the pinning effect weakens gradually with the thickness of cell boundary decreasing and strengthens gradually with the cell size decreasing. Because of the intergrain exchange coupling, the coercivity mechanism is determined by the difference in magnetocrystalline anisotropy between the cell phase and the cell boundary phase. And the coercivity mechanism is related to not only the cells alignment but also temperature. With temperature increasing, a transformation of the demagnetization mechanism occurs from the domain pinning to the uniform magnetization reversal mode and the transformation temperature is about 650 K.

Key words: micromagnetic finite element method, microstructure, cell orientation, temperature

中图分类号:  (Magnetization curves, hysteresis, Barkhausen and related effects)

  • 75.60.Ej
61.66.Dk (Alloys ) 75.30.Gw (Magnetic anisotropy) 75.50.Ww (Permanent magnets) 75.60.Jk (Magnetization reversal mechanisms)