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Coverage-dependent magnetic and electronic properties of graphene with Co adatoms

Author

Listed:
  • Min Gao

    (School of Physical Science and Technology, Soochow University, Suzhou 215006, P. R. China†Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006, P. R. China)

  • Jun Hu

    (School of Physical Science and Technology, Soochow University, Suzhou 215006, P. R. China†Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006, P. R. China‡School of Physical Science and Technology, Ningbo University, Ningbo 315211, P. R. China)

Abstract

Decorating two-dimensional (2D) materials with transition-metal adatoms is an effective way to bring about new physical properties that are intriguing for applications in electronics and spintronics devices. Here, we systematically studied the coverage-dependent magnetic and electronic properties of graphene decorated by Co adatoms, based on first-principles calculations. We found that if the Co coverage is larger than 1/3ML, the Co atoms will aggregate to form a Co monolayer and then a van der Waals bilayer system between the Co monolayer and graphene forms. When the Co coverage is ≤1∕3ML, the Co adatom is spin-polarized with spin moment varying from 1.1 to 1.4μB. The dxz∕yz and dxy∕x2−y2 orbitals of Co hybridize significantly with the π bands of graphene, which generates a series of new bands in the energy range from −2eV to 1eV with respect to the Dirac point of graphene. In most cases, the new bands near the Fermi level lead to topological states characterized by the quantum anomalous Hall effect.

Suggested Citation

  • Min Gao & Jun Hu, 2021. "Coverage-dependent magnetic and electronic properties of graphene with Co adatoms," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 32(12), pages 1-11, December.
    • Handle: RePEc:wsi:ijmpcx:v:32:y:2021:i:12:n:s0129183121501655
    DOI: 10.1142/S0129183121501655
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