Effect of Mini Ga Doping in Nanocrystalline Nd4.5(Fe,Co)77.5B18 Magnet on Coercivity


Article Preview

The microstructure and the coercivity of nanocomposite Nd4.5Fe76.5-xGaxCo1.0B18 (x=0~0.6at%)bonded magnets were studied. The results showed that addition of small amount of Ga in Nd4.5Fe76.5-xGaxCo1.0B18 made the grains finer and more uniform. A notable peak of coercivity was observed in the variational curve of coercivity with annealing time when Ga content was low (x=0.2). This phenomenon could be explained by the microstructure and the exchange coupling interaction of two-phase nanocomposite.



Materials Science Forum (Volumes 475-479)

Main Theme:

Edited by:

Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie




M. Zhu et al., "Effect of Mini Ga Doping in Nanocrystalline Nd4.5(Fe,Co)77.5B18 Magnet on Coercivity", Materials Science Forum, Vols. 475-479, pp. 2147-2150, 2005

Online since:

January 2005




[1] R Skomski, J M D. Coey Phys. Rev. 1993, 48B , 15812.

[2] T Schrefl , J Fidler and H Kronmüller . Phys. Rev. B, 1994, 49: 6100~6110.

[3] H Kronmüller, R Fischer , M Seeger and A Zern . J. Phys. D: Appl. Phys. 1996, 29: 2274~2283.

[4] R Fischer , T Schrefl , H Kronmüller , J Fidler . J. Magn. Magn. Mat. 1995, 150: 329~344.

[5] Minggang Zhu, Wei Li, Xiumei li and Yongquan Guo Acta Metallurgica Sinica 2003; 39(2)217-220 (in Chinese).

[6] B Gried and K Fritz J. Appl. phys. 1991, 70: 6447~6450.

[7] D. H Ping , K Hono and S Hirosawa. J. Appl. Phys. 1998, 83: 7769~7773.

[8] Y. L Chu., L. Y. Xiong , X. K. Sun . Acta Metallurgica Sinica., 34(1998): 423-430.