Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)
O 27.107: Poster
Dienstag, 24. März 2009, 18:30–21:00, P2
Magnetism of Rh nano-structures on inert Xe buffer layers and in contact with Ag(100) surfaces — •violetta sessi1, jian zhang1, klaus kuhnke1, carsten tieg2, axel enders3, jan honolka1, and klaus kern1 — 1Max Planck Institut für Festkörperforschung, Stuttgart, Deutschland — 2European Synchrotron Radiation Facility, Grenoble, France — 3University of nebraska, Lincoln, USA
Previous x-ray magnetic circular dichroism measurements have shown that sub-monolayer coverages of Rh directly deposited on Ag(100) at T=5K are not magnetic [1], in contrast to theoretical predictions [2]. We have investigated this discrepancy and studied the magnetism of Rh nano-structures prepared on inert Xe buffer layers (Buffer Layer Assisted Growth [3]) on Ag(100). For Rh nano-structures (monomers, dimers, trimers etc.) situated on the Xe buffer layer we find a cluster size-dependent magnetic moment similar to the one measured on free clusters in the Stern-Gerlach experiment [4]. During desorption of the Xe layer the Rh nano-structures grow in size and make contact with the substrate, which leads to a full quenching of the magnetic moment. The results are discussed modelling the Rh cluster size distribution and magnetic ordering on Xe and Ag(100).
[1] J. Honolka et al., Phys. Rev. B 76, 144412 (2007) [2] P. Lang, V.S. Stepanyuk, K. Wildberger, R. Zeller, and P.H. Dederichs., Solid State Commun. 92, 755 (1994) [3] J.H. Weaver, G.D. Waddill, Science 251, 1444 (1991) [4] A.J. Cox, J. G. Louderback, and L.A. Bloomfield, Phys. Rev. Lett. 71, 923 (1993)