Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 12: Nanostructures at surfaces: Dots, particles, clusters I (magnetic)

O 12.6: Talk

Monday, March 23, 2009, 16:15–16:30, SCH A215

Utilizing the Quantum Confinement on Islands for Exchange Interaction Tailoring: an Ab-Initio Study — •Oleg O. Brovko and Valeri S. Stepanyuk — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

Vacuum barriers at island borders inevitably confine the surface electrons to the island’s geometry. Electron density redistribution which arises from such a confinement can have a substantial effect on the magnetic interaction of impurities adsorbed on top of the island. Our ab-initio calculations for 3d adatoms adsorbed on islands clearly demonstrate that by varying the island’s size it is possible to tailor the surface-state-mediated exchange interactions of adatoms at separations ranging from several angstroms to several nanometers. By deliberate choice of the islands size the exchange coupling can be enhanced, weakened or even reversed.