Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 65: Poster 2
MA 65.3: Poster
Friday, March 24, 2017, 09:30–13:00, P2-OG1
Controlling the magnetic anisotropy of adsorbed Fe porphyrins by a ring-closure reaction — •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 the intramolecular reaction mediated by thermal stimulation undergone by iron octaethylporphyrin adsorbed onto a Au(111) single crystal substrate. Through a ring-closure process, the molecule turns into iron tetrabenzoporphyrin when subjected to an annealing temperature of 550 K [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 magnetic anisotropy of the molecule after ring closure is reduced by a factor of six, while the iron magnetic moment is substantially increased. — Financial support by project VEKMAG (BMBF 05K13KEA) and CAPES is gratefully acknowledged.
[1] B. W. Heinrich et al., Nano Lett. 13 (10), 4840 (2013).