中国物理B ›› 2003, Vol. 12 ›› Issue (6): 661-664.doi: 10.1088/1009-1963/12/6/316

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Sm3(Fe,Co,Mo)29 compounds: promising materials for permanent magnets

申江1, 陈难先1, 刘宝丹2, 王建立2, 吴光恒2, 杨伏明2, 李伟星3, de Boer Frank4   

  1. (1)Institute of Physics, Beijing University of Science and Technology, Beijing 100083, China; (2)State key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; (3)State key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; Institute of Physics, Beijing University of Science and Technology, Beijing 100083, China; (4)van der Waals－Zeeman Instituut, Universiteit van Amsterdam, Valckenierstraat 65,1018
  • 收稿日期:2002-12-26 修回日期:2003-03-06 出版日期:2003-06-16 发布日期:2005-03-16
  • 基金资助:
    Project supported by the State Key Development Program for Basic Research of China (Grant No G2000067106).

Sm3(Fe,Co,Mo)29 compounds: promising materials for permanent magnets

Li Wei-Xing (李伟星)ab, Liu Bao-Dan (刘宝丹)a, Wang Jian-Li (王建立)a, Shen Jiang (申江)b, Wu Guang-Heng (吴光恒)a, Yang Fu-Ming (杨伏明)a, Chen Nan-Xian (陈难先)b, de Boer Frankc   

  1. a State key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; b Institute of Physics, Beijing University of Science and Technology, Beijing 100083, China; c van der Waals－Zeeman Instituut, Universiteit van Amsterdam, Valckenierstraat 65,1018 XE Amsterdam, The Netherlands
  • Received:2002-12-26 Revised:2003-03-06 Online:2003-06-16 Published:2005-03-16
  • Supported by:
    Project supported by the State Key Development Program for Basic Research of China (Grant No G2000067106).

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摘要： The outstanding hard-magnetic properties are reported of Sm_3Fe_{28.1-x}Co_xMo_{0.9} compounds with x=12, 14, 16. In this alloy system, only a small amount of Mo is needed to stabilize the 3:29 structure so that the magnetic properties are not seriously affected by the presence of this nonmagnetic element. Substitution of Co for Fe leads to a significant increase of the magnetic anisotropy, and for x≥14 the easy magnetization direction changes from easy plane to the easy axis. In this alloy system, the compound Sm_3Fe_{12.1}Co_{16}Mo_{0.9} is a very promising candidate for permanent magnet applications. Its room temperature saturation magnetization (μ_0M_s=1.5 T) and anisotropy field (B_{an}=6.5 T) are comparable to the values for Nd_2Fe_{14}B (μ_0M_s=1.6 T and B_{an}=7 T). However, the Curie temperature of Sm_3Fe_{12.1}Co_{16}Mo_{0.9} is 1020 K, which is appreciably higher than that for Nd_2Fe_{14}B (T_C=588 K).

Abstract: The outstanding hard-magnetic properties are reported of Sm$_3$Fe$_{28.1-x}$Co$_x$Mo$_{0.9}$ compounds with x=12, 14, 16. In this alloy system, only a small amount of Mo is needed to stabilize the 3:29 structure so that the magnetic properties are not seriously affected by the presence of this nonmagnetic element. Substitution of Co for Fe leads to a significant increase of the magnetic anisotropy, and for x≥14 the easy magnetization direction changes from easy plane to the easy axis. In this alloy system, the compound Sm$_3$Fe$_{12.1}$Co$_{16}$Mo$_{0.9}$ is a very promising candidate for permanent magnet applications. Its room temperature saturation magnetization ($\mu_0M_s=1.5$ T) and anisotropy field ($B_{\rm an}=6.5$ T) are comparable to the values for Nd$_2$Fe$_{14}$B ($\mu_0M_s=1.6$ T and $B_{\rm an}=7$ T). However, the Curie temperature of Sm$_3$Fe$_{12.1}$Co$_{16}$Mo$_{0.9}$ is 1020 K, which is appreciably higher than that for Nd$_2$Fe$_{14}$B ($T_{\rm C}=588$ K).

Key words: permanent magnet material, anisotropy, saturation magnetization, Curie temperature

中图分类号:  (Permanent magnets)

  • 75.50.Ww
75.30.Gw (Magnetic anisotropy) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))