Theory of electrically-tunable coupling between magnetic nanoparticles on graphene

POSTER

Abstract

We will present a study of the dependence on graphene carrier density of the coupling between magnetic nanoparticles adsorbed on a graphene sheet. Small system {\it ab initio} coupling strength results will be compared with semi-analytic results based on a phenomenological Dirac-band model for graphene's $\pi$-bands. The model calculation uses kinetic exchange coupling parameters for the interaction between a magnetic nanoparticle and the graphene $\pi$-bands that are extracted from {\it ab initio} results for graphene/ferromagnetic metal interfaces.

Authors

  • Hua Chen

    • University of Tennessee at Knoxville, University of Texas at Austin

  • Qian Niu

    • The University of Texas at Austin
    • University of Texas at Austin
    • Department of Physics, The University of Texas at Austin, Austin, Texas 78712 USA
    • Department of Physics, The University of Texas at Austin

  • Zhenyu Zhang

    • University of Science and Technology of China
    • University of Science and Technology of China, Harvard University, University of Texas at Austin
    • Department of Physics and Astronomy, University of Tennessee; ICQD, University of Science and Technology of China, Hefei, Anhui, China
    • U of Sci. \& Tech. of China, Harvard U

  • A.H. MacDonald

    • University of Texas at Austin
    • The University of Texas at Austin, Austin, TX