Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 5: Magnetic Nanostructures

O 5.3: Talk

Monday, February 25, 2008, 11:45–12:00, MA 043

Ab initio Study of Spin-polarized Bound States in Magnetic Dimers on Metal Surfaces — •Oleg O. Brovko, Valeri S. Stepanyuk, and Patrick Bruno — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

Interaction of single adatoms with surface state electrons has been shown to produce a bound state below the surface state band bottom [1,2]. Similar states have been revealed at nonmagnetic Cu chains [2]. Using ab initio KKR Green’s function method we study the spin-polarized bound state arising at magnetic dimers on noble metal surfaces. We demonstrate that the spin-splitting of the bound state can be utilized to determine the exchange coupling of a magnetic dimer.

[1] L. Limot, E. Pehlke, J. Kröger, and R. Berndt, Phys. Rev. Lett. 94, 036805 (2005). [2] V. S. Stepanyuk, A. N. Klavsyuk, L. Niebergall, and P. Bruno, Phys. Rev. B 72, 153407 (2005)