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Chin. Phys. B, 2009, Vol. 18(10): 4490-4496    DOI: 10.1088/1674-1056/18/10/065
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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 (=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.
Keywords:  electronic structure      atomic magnetic moment      exchange coupling      Curie temperature  
Received:  14 October 2008      Revised:  19 April 2009      Accepted manuscript online: 
PACS:  71.20.Lp (Intermetallic compounds)  
  72.25.-b (Spin polarized transport)  
  75.30.Cr (Saturation moments and magnetic susceptibilities)  
  75.30.Et (Exchange and superexchange interactions)  
  75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))  
  75.50.Ww (Permanent magnets)  
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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