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O: Fachverband Oberflächenphysik

O 82: [MA] Graphene (jointly with DY, DS, HL, O, TT)

O 82.7: Talk

Thursday, March 17, 2011, 16:45–17:00, HSZ 401

Magnetic clusters on graphene flakes — •Wolfgang Landgraf, Sam Shallcross, and Oleg Pankratov — Lehrstuhl fur Theoretische Festkorperphysik, Staudstr. 7-B2, 91058 Erlangen, Germany.

We present an investigation of the properties of magnetic ad-atoms and clusters on graphene flakes. We consider clusters of 1-7 atoms of metals from the 3d series assembled on graphene flakes composed of the order of 100 carbon atoms. All calculations are performed within the spin density functional theory formalism in the local density approximation. We elucidate the range of the magnetic interaction for pairs of magnetic ad-atoms on graphene flakes, as well as the equilibrium magnetic structure for various cluster types. By a comparison of such clusters on flakes with their counterparts on extended sheets, we are able to elucidate the role of the flake shape upon the magnetic interaction. In this way we determine the role of confinement on the magnetic interaction, and comment on the possibility of using flake shape as a design parameter of magnetic nanostructures on graphene flakes.