Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 31: Surface Magnetism / Magnetic Imaging II
MA 31.12: Vortrag
Donnerstag, 25. März 2010, 18:15–18:30, H23
Magnetism of Rh nano-structures on inert Xe buffer layers and in contact with Ag(100) surfaces — •J. Honolka1, V. Sessi1,2, K. Kuhnke1, C. Tieg2, O. Sipr3, J. Minar4, H. Ebert4, and K. Kern1 — 1MPI für Festkörperforschung, Stuttgart, Germany — 2ESRF, Grenoble, France — 3Academy of Sciences of the Czech Republik, Prague, Czech Republik — 4LMU München, Germany
Previous x-ray magnetic circular dichroism measurements have shown that submonolayer coverages of Rh directly deposited on Ag(100) at T=5K are not magnetic [1], in contrast to theoretical predictions (see [2] and references therein). We further investigated this discrepancy and studied the magnetism of nano-structures of Rh prepared on inert Xe buffer layers on Ag(100). For Rh nano-structures (monomers, dimers, trimers etc.) situated on the Xe buffer layer we find a cluster size dependet magnetic moment similar to the one measured on free clusters in the Stern-Gerlach experiment [3]. 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 on Xe and Ag(100) and comparing the spectroscopy results with ab initio theory.
[1] J. Honolka et al., Phys. Rev. B 76, 144412 (2007) [2] V. Bellini, N. Papanikolaou, R. Zeller, and P. H. Dederichs, Phys. Rev. B 64, 094403 (2001) [3] A.J. Cox, J. G. Louderback, and L.A. Bloomfield, Phys. Rev. Lett. 71, 923 (1993)