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MA: Fachverband Magnetismus
MA 4: Bio- und molekularer Magnetismus
MA 4.5: Vortrag
Montag, 7. März 2016, 10:45–11:00, H33
X-ray absorption study of thermally-induced electrocyclic ring closure of iron porphyrin molecules on Au(111) — •Lucas M. Arruda1, Md. Ehesan Ali2, Matthias Bernien1, Fabian Nickel1, Jens Kopprasch1, Peter M. Oppeneer2, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, 14195 Berlin, Germany — 2Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
Metalloporphyrins’ stability and tunability make them well-suited candidates for use in molecular spintronics. In this context the understanding of the on-surface properties and reactions of such systems is of great relevance. In this work we investigate a particular porphyrin molecule, iron octaethylporphyrin and its transition to iron tetrabenzoporphyrin through a surface-assisted intramolecular ligand reaction mediated by thermal stimulation on a Au(111) single crystal substrate [1]. Near edge x-ray absorption fine structure, x-ray magnetic circular dichroism, and density-functional-theory-calculated density of states (DOS) results are presented to display the modifications resulting from this process. We find the iron magnetic moment is substantially increased, a result corroborated by the calculated DOS, which suggests a change in the spin state from 1 to 3/2. — Financial support by project VEKMAG (BMBF 05K13KEA) and CAPES is gratefully acknowledged.
[1] B. W. Heinrich et al., Nano Lett. 13 (10), 4840 (2013).