Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Nanostructures at Surfaces III (Dots, Particles, Clusters)

O 30.4: Vortrag

Dienstag, 27. März 2007, 16:30–16:45, H36

Evolution of spin-polarized surface states on magnetic nanostructures: from a single adatom to monolayers — •Pavel Ignatiev, Valeriy Stepanyuk, Larissa Niebergall, and Patrick Bruno — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

Co nanoislands on metallic substrates have been investigated recently both theoretically and experimentally [1-3]. Surface states on Co nanoislands are spin-polarized. A pronounced peak of minority-spin character originating from strong hybridization of Co d-states with s-p states has been found below the Fermi energy. Here, we present the state-of-the-art ab initio calculations of electronic surface states on magnetic cobalt nanostructures placed on metallic substrates (Cu(111), Ag(111) and Au(111) ). The evolution of spin-polarized surface states from a single adatom to monolayers is demonstrated. Interplay between structure of cobalt nanoislands and spin-polarized surface states is discussed.

[1] L. Diekhöner, M. A. Schneider, A. N. Baranov, V. S. Stepanyuk, P. Bruno, and K. Kern, PRL 90, 236801 (2003)

[2] O. Pietzsch, A. Kubetzka, M. Mode, and R. Wiesendanger, PRL 92, 057202 (2004)

[3] M. V. Rastei, J.P. Bucher, P.A. Ignatiev, V.S. Stepanyuk, and P. Bruno, submitted to PRB