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
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
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).
Received: 26 December 2002
Revised: 06 March 2003
Accepted manuscript online:
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
Fund: Project supported by the State Key Development Program for Basic Research of China (Grant No G2000067106).
Cite this article:
Li Wei-Xing (李伟星), Liu Bao-Dan (刘宝丹), Wang Jian-Li (王建立), Shen Jiang (申江), Wu Guang-Heng (吴光恒), Yang Fu-Ming (杨伏明), Chen Nan-Xian (陈难先), de Boer Frank Sm3(Fe,Co,Mo)29 compounds: promising materials for permanent magnets 2003 Chinese Physics 12 661
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