Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Surface Magnetism

MA 13.8: Vortrag

Dienstag, 26. Februar 2008, 12:15–12:30, EB 301

Orbital magnetic moment of single Co atom on Pt(111) surface - a view from correlated band theory — •Alexander Shick¹ and Alexander Lichtenstein² — ¹Institute of Physics ASCR, Na Slovance 2, Prague, Czech Republic — ²University of Hamburg, Jungiusstrasse 9, 20355 Hamburg

The electronic and magnetic character of Co adatom on the Pt(111) surface is investigated. The relativistic version of the correlated band theory LSDA+U method (including spin-orbit coupling) is employed to induce the orbital polarization. It is shown that with a reasonable choice of Coulomb-U, LSDA+U calculations give the orbital magnetic moment of Co adatom in a good agreement with experimental XMCD data (P. Gambardella et al., Science 300 (2003) 1130). Both the electron correlation induced orbital polarization and the structural relaxation play an essential role in the orbital moment formation. Microscopic origins of the orbital moment enhancement are discussed.