Dresden 2009 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 26: Nanostructures at surfaces: Dots, particles, clusters II (SPM)

O 26.4: Vortrag

Dienstag, 24. März 2009, 15:45–16:00, SCH A215

Interaction of the STM tip with adatoms on metal surfaces: ab initio study — •Kun Tao¹, Valeri S Stepanyuk¹, and Patrick Bruno² — ¹Max-Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany — ²European Synchrotron Radiation Facility BP 220, F-38043 Grenoble Cedex, France

Using first-principles calculations based on the density functional theory, we investigate interaction of the STM tip with magnetic adatoms on metal surfaces. We perform calculations in the fully relaxed geometries for the tip and the substrate. Both interactions with nonmagnetic and magnetic tips are studied. We concentrate on 3d transition metal adatoms supported on Cu(001) and Cu(111) surfaces. The exchange interaction of the magnetic tip with 3d transition metal adatoms supported on Cu(001) surface is discussed. Our results indicate that the spin direction of the magnetic adatoms can be manipulated by approaching the tip to the substrate. The interplay between the structure relaxations and the electronic properties of the junction is revealed.