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The role of size in spin properties of zigzag graphene nanoribbon

  • J. H. Zhao
  • X. Q. DaiEmail author
  • B. Zhao
  • Y. W. Dai
  • X. Zhao
Regular Article

Abstract

The effects of ribbon size on the spin properties of zigzag graphene nanoribbon (ZGNR) with and without edge pentagon-heptagon reconstruction are investigated using spin-polarized density functional theory. It is found that when ribbon width is less than 26.31 Å, the Coulomb and RKKY-like interaction between two ribbon-edges result in the edge state splitting. For a wider ZGNR, the interedge coupling is negligible. In addition to stabilizing the system and weakening the interedge coupling, the edge pentagon-heptagon reconstruction could demagnetize the ZGNR. In perfect and single-edge reconstructed ZGNR, the magnetic moment depends on ribbon width, and the change of magnetic moment becomes inconspicuous with increasing ribbon width. Double-edge reconstructed ZGNR shows nonmagnetic. It may be useful for fabricating graphene-based nanoelectronic and spintronic devices.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • J. H. Zhao
    • 1
  • X. Q. Dai
    • 1
    • 2
    Email author
  • B. Zhao
    • 1
  • Y. W. Dai
    • 1
  • X. Zhao
    • 1
  1. 1.College of Physics and Information EngineeringHenan Normal UniversityHenanP.R. China
  2. 2.Department of Physics Zhengzhou Teachers CollegeHenanP.R. China

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