Electronic structures and magnetic properties in SmCo7-xMx
Wang Pei-Ji(王培吉)a)b)†, Kao Hong(考红)c), Zhang Chang-Wen(张昌文)b), Yu Feng(于峰)b), and Zhou Zhong-Xiang(周忠祥)a)
a School of Science, Harbin Institute of Technology, Harbin 150001, China; b School of Science, University of Jinan, Jinan 250022, China; c Library, North China Institute of Science and Technology, Beijing 101601, China
Abstract The electronic structures and magnetic properties of SmCo7-xMx (M =Ti, Si, Zr, Hf, Cu, B, Ag, Ga, Mn) compounds are investigated by using a spin-polarized MS-X.$\alpha$ method. The results show that the long-range ferromagnetic order is determined by a stronger 3d--5d interaction, rather than the traditional RKKY interaction, and the effects of doping element M on 3d--5d coupling are negligible in Sm--Co-based compounds. The nonmagnetic dopant Si atoms have a larger effect on the moments of 2e site although they preferably occupy the Co 3g sites, which results in the stronger uniaxial anisotropy of this compound. Analysis of the formation energies indicates that 5d-element doped compounds are more stable than other dopants, and furthermore, they have a higher Curie temperature above room temperature, which will be in favor of their potential application as high-temperature permanent magnets.
Received: 14 October 2008
Revised: 19 April 2009
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10847134 and
60471042) and the Natural Science
Foundation of Shandong Province, China (Grant No Y2005A05).
Cite this article:
Wang Pei-Ji(王培吉), Kao Hong(考红), Zhang Chang-Wen(张昌文), Yu Feng(于峰), and Zhou Zhong-Xiang(周忠祥) Electronic structures and magnetic properties in SmCo7-xMx 2009 Chin. Phys. B 18 4490
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