Effect of Co substitution on magnetic properties and magnetic entropy changes in LaFe11.83Si0.94Al0.23 compounds
Shen Jun (沈俊)ab, Li Yang-Xian (李养贤)a, Wang Fang (王芳)b, Wang Guang-Jun (王光军)b, Zhang Shao-Ying (张绍英)b
a School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China; b State Key Laboratory of Magnetism, Institute of Physics and Centre of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
Abstract Effect of Co substitution on magnetic properties and magnetic entropy changes in LaFe$_{11.83}$Si$_{0.94}$Al$_{0.23}$ compounds has been investigated by means of magnetization measurements. X-ray diffraction shows the prepared compounds to be single phase with the cubic NaZn$_{13}$-type structure. Substitution of Co for Fe leads to an increase of Curie temperature of the material. The magnetic entropy changes in LaFe$_{11.83}$Si$_{0.94}$Al$_{0.23}$ and LaFe$_{11.03}$Co$_{0.80}$Si$_{0.94}$Al$_{0.23}$ compounds are 21.8J/(kg$\cdot$K) to 16.9J/(kg$\cdot$K) under a magnetic field change of 0－5T at Curie temperature, respectively. Giant magnetic entropy changes are attributed to the higher magnetization and the rapid change in magnetization at Curie temperature.
Received: 09 January 2004
Revised: 21 March 2004
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10174094).
Cite this article:
Shen Jun (沈俊), Li Yang-Xian (李养贤), Wang Fang (王芳), Wang Guang-Jun (王光军), Zhang Shao-Ying (张绍英) Effect of Co substitution on magnetic properties and magnetic entropy changes in LaFe11.83Si0.94Al0.23 compounds 2004 Chinese Physics 13 1134
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