中国物理B ›› 2008, Vol. 17 ›› Issue (6): 2281-2287.doi: 10.1088/1674-1056/17/6/058

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Magnetic domain structures of precipitation-hardened SmCo 2:17-type sintered magnets: Heat treatment effect

李岫梅1, 方以坤1, 郭朝晖1, 刘涛1, 郭永权1, 李卫1, 韩宝善2   

  1. (1)Division of Functional Materials Research, Central Iron & Steel Research Institute, Beijing 100081, China; (2)State Key Laboratory of Magnetism, Institute of Physics and the Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2007-11-17 修回日期:2007-12-13 出版日期:2008-06-20 发布日期:2008-06-20
  • 基金资助:
    Project supported by the Beijing Municipal Science and Technology Committee Key Project, China (Grant No D0406002000091) and the National Natural Science Foundation of China (Grant No 10374110).

Magnetic domain structures of precipitation-hardened SmCo 2:17-type sintered magnets: Heat treatment effect

Li Xiu-Mei(李岫梅)a)†, Fang Yi-Kun(方以坤)a), Guo Zhao-Hui(郭朝晖)a), Liu Tao(刘涛)a), Guo Yong-Quan(郭永权)a), Li Wei(李卫)a), and Han Bao-Shan(韩宝善)b)   

  1. a Division of Functional Materials Research, Central Iron & Steel Research Institute, Beijing 100081, China; b State Key Laboratory of Magnetism, Institute of Physics and the Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2007-11-17 Revised:2007-12-13 Online:2008-06-20 Published:2008-06-20
  • Supported by:
    Project supported by the Beijing Municipal Science and Technology Committee Key Project, China (Grant No D0406002000091) and the National Natural Science Foundation of China (Grant No 10374110).

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摘要： The typical magnetic domains of Sm(CobalFe0.25Cu0.07Zr0.02)7.4 magnets quenched through various heat-treatment steps have been revealed by using magnetic force microscopy (MFM). For the specimens in which the nominal c-axis is perpendicular to the imaging plane, the domain configurations change from plate-like for the as-sintered magnet to corrugation and spike-like for the homogenized one, and then to a coarse and finally to a finer domain structure when isothermally aged at 830\du\ and then annealed at 400\du. However, only plate-like domains can be detected on the surfaces with the nominal c-axis parallel to the imaging plane. The finer domain (so-called interaction domain) is a characteristic magnetic domain pattern of the Sm--Co 2:17-type magnets with high coercivities. Domain walls in a zigzag shape are revealed by means of MFM in final bulk Sm--Co 2:17-type sintered magnets.

关键词: Sm--Co permanent magnets, magnetic domains, heat-treatment, magnetic force microscopy

Abstract: The typical magnetic domains of Sm(CobalFe0.25Cu0.07Zr0.02)7.4 magnets quenched through various heat-treatment steps have been revealed by using magnetic force microscopy (MFM). For the specimens in which the nominal c-axis is perpendicular to the imaging plane, the domain configurations change from plate-like for the as-sintered magnet to corrugation and spike-like for the homogenized one, and then to a coarse and finally to a finer domain structure when isothermally aged at 830℃ and then annealed at 400℃. However, only plate-like domains can be detected on the surfaces with the nominal c-axis parallel to the imaging plane. The finer domain (so-called interaction domain) is a characteristic magnetic domain pattern of the Sm--Co 2:17-type magnets with high coercivities. Domain walls in a zigzag shape are revealed by means of MFM in final bulk Sm--Co 2:17-type sintered magnets.

Key words: Sm--Co permanent magnets, magnetic domains, heat-treatment, magnetic force microscopy

中图分类号:  (Domain walls and domain structure)

  • 75.60.Ch
75.50.Ww (Permanent magnets) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 75.60.Nt (Magnetic annealing and temperature-hysteresis effects) 81.40.Cd (Solid solution hardening, precipitation hardening, and dispersion hardening; aging) 81.40.Ef (Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization)