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MA: Fachverband Magnetismus

MA 9: Surface Magnetism II

MA 9.7: Vortrag

Montag, 23. März 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 Gambardella^1,4 — 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.