Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)
O 18.42: Poster
Montag, 25. Februar 2008, 18:30–19:30, Poster F
Mn/Cu(111): alloying, electronic and magnetic properties — Marko Kralj1, Christian Breinlich2, Sanja Krajinovic1, Petar Pervan1, Conrad Becker2, and •Klaus Wandelt2 — 1Institute of Physics, Bijenicka 46, HR-10000 Zagreb — 2Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstr. 12, 53115 Bonn
Spin-split two-dimensional (2D) states which can, for instance, be realized in magnetically stabilized surface alloys, are of immense technological interest for new spintronic devices. For example, Mn/Cu(100)-c(2x2) is considered as a prototypical 2D magnetic alloy [1]. We have studied the interaction of manganese with a Cu(111) surface using different surface sensitive techniques. While the electronic structure and perfectness of a periodic root-3 alloy were characterized by ARPES and LEED, the electronic characteristics of the surface occupied by single Mn atoms were studied by STM and STS. STS at low temperature indicates no observable Kondo-effect for single Mn atoms. Increasing the temperature, leads to incorporation of Mn atoms into and below the surface layer and the appearance of very specific surface defect structures. Formation of this surface alloy first leads to the quenching of the Cu(111) surface state. Only after annealing higher than 500 K, when Mn atoms are incorporated several layers deep, leading to complex changes in the LEED pattern, ARPES indicates the appearance of a modified surface state. All this seems to indicate none or very weak magnetic and spin-splitting effects for Mn/Cu(111).
[1] M. Wuttig, Y. Gauthier, S. Blügel, Phys.Rev.Lett. 70 (1993) 3619.