Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: [MA] Graphene (jointly with DY, DS, HL, O, TT)
O 82.5: Vortrag
Donnerstag, 17. März 2011, 16:15–16:30, HSZ 401
Emergent magnetism of 5d transition-metal adatoms on Graphene — •Hongbin Zhang1, Cesar Lazo2, Stefan Blügel1, Stefan Heinze2, and Yuriy Mokrousov1 — 1Peter Grünberg Institut & Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 2Institute of Theoretical Physics and Astrophysics, University of Kiel, 24098 Kiel, Germany
Owing to its peculiar electronic structure, graphene serves as a playground for many interesting physical properties and has drawn a lot of attention recently [1]. In this work, using the first principles FLAPW methods, we investigate the magnetism of 5d transition metal (TM) atoms from Hf to Pt deposited on graphene in different supercell geometries. By taking into account the effect of atomic relaxations, we find that most of the 5d TMs exhibit strong local magnetism when deposited on graphene. A combination of large spin moments with strong spin-orbit coupling in considered adatoms leads to gigantic values of the magnetic anisotropy energies, reaching values as large as 30 meV/atom. We also investigate the influence of external electric fields on the magnetic properties of 5d TM adatoms and discuss possible transport applications. We acknowledge funding under HGF-YIG Programme VH-NG-513.
[1] A. H. C. Neto, et al., Rev. Mod. Phys. 81, 109 (2009).