Magnetic anisotropy driven by enhanced spin-orbital coupling of <i>sp</i> metal Bi on Au /Si(111) root3 surface

POSTER

Abstract

Realization of magnetic properties from non-magnetic elements is an interesting issue recently. Using first-principles calculations based on DFT, we study of 1/3 monolayer Bi-covered Au/Si(111) surface and find that such system can be magnetic remarkably. Our further analysis reveals that the large spin-orbit coupling of Bi (px, py) multi-orbitals at the Fermi level leads to an occupancy disparity between spin channels. And this occupancy disparity will break Krammers degeneracy, resulting in a non-magnetic to significant ferromagnetic phase transition. Moreover, the relatively large and anisotropic Rashba splitting at the interface damps the in-plane ferromagnetism, giving rise to an exceptionally large magnetic anisotropy energy up to 6.5 meV (with Mz/Mx,y~3). Our studies provide a potential candidate system for achieving an intrinsic quantum anomalous Hall effect with temperature up to 70 K.

*NSF of China (grant nos. 11304288, 11774078)

Presenters

  • Chong Li

    • School of physics and engineering, Zhengzhou University

Authors

  • Chong Li

    • School of physics and engineering, Zhengzhou University

  • Han Wang

    • Rensselaer Polytechnic Institute
    • Chemical Sciences Division, Lawrence Berkeley National Laboratory

  • Chunyao Niu

    • School of Physics and Engineering, Zhengzhou University
    • School of physics and engineering, Zhengzhou University

  • Fei Wang

    • School of physics and engineering, Zhengzhou University

  • Yu Jia

    • School of Physics and Engineering, Zhengzhou University
    • School of physics and engineering, Zhengzhou University

  • Zhenyu Zhang

    • University of Science and Technology of China
    • ICQD, University of Science and Technology of China
    • Louisiana State University

  • Shengbai Zhang

    • Physics, Rensselaer Polytechnic Institute
    • Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute
    • Rensselaer Polytechnic Institute
    • Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute