Dresden 2009 – scientific programme
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MA: Fachverband Magnetismus
MA 9: Surface Magnetism II
MA 9.7: Talk
Monday, March 23, 2009, 16:45–17:00, HSZ 403
Giant orbital moment anisotropy of Cu-Phthalocyanine adlayers at a metal interface — •Sebastian Stepanow1, Aitor Mugarza1, Gustavo Ceballos1, Paolo Moras2, Julio Criginski Cezar3, Carlo Carbone2, and Pietro Gambardella1,4 — 1CIN2-ICN Barcelona — 2CNR Trieste — 3ESRF Grenoble — 4ICREA Barcelona
The magnetic properties of transition metal ions embedded in metal-organic complexes have attracted wide interest due to the interplay between spin and orbital phenomena. Recent studies, however, have shown that the deposition of Metal-Phthalocyanine (MePc) molecules on metal substrates may quench their magnetic moment. Here we investigate the magnetic properties of CuPc adlayers on a Ag(100) surface by x-ray magnetic circular dichroism (XMCD). The Cu centers present a robust spin S=1/2 magnetic moment with extraordinary high orbital moment (L) anisotropy. This effect, amounting to a 400% change of L from the in-plane to out-of-plane direction, is an order of magnitude larger compared to metallic layers and is accompanied by an unprecedented large spin-dipole moment T. By means of ligand-field multiplet theory we are able to simulate both the magnetic moment components and XMCD spectra versus applied field, relating these findings to the electronic structure of the adsorbed molecules.