Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.88: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Structure and magnetism of Mn-tetrapyridyl porphyrin molecules on Ag(111) — Tobias R. Umbach1, •Christian Felix Hermanns1, Alex Krüger1, Zechao Yang1, Isabel Fernández-Torrente1, Nils Krane1, Matthias Bernien1, Constantin Czekelius2, Katharina J. Franke1, Jose I. Pascual1, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Germany — 2Institut für Chemie und Biochemie - Organische Chemie, Freie Universität Berlin, Germany
Deposition of metal porphyrines on metallic surfaces can lead to the modification of the magnetic moment of the metal ion. We investigated a submonolayer 5,10,15,20-Tetrakis-(4-pyridyl)-porphyrin-Mn(III)-chloride (TPyP-Mn(III)-Cl) on a Ag(111) surface by Low Temperature Scanning Tunneling Microscopy (LT-STM) and X-Ray Magnetic Circular Dichroism (XMCD). Our measurements reveal that T4PyP-Mn(III)-Cl forms a self-assembled ordered phase with a small fraction of ordered second-layer molecules even for submonolayer coverage after annealing to 370 K. The first monolayer consists of domains with alternating molecular rows. The second layer forms a square lattice on top of the first monolayer. By Low Temperature Scanning Tunneling Spectroscopy (LT-STS) we identify similar resonances of the metallic ion of TPyP-Mn(III)-Cl molecules in the first and second monolayer, indicating no strong interactions with the metallic surface underneath. XMCD measurements on the same system show that the TPyP-Mn(III)-Cl molecules keep a magnetic moment upon adsorption with an easy axis along the surface normal.