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O: Fachverband Oberflächenphysik

O 88: Electronic Structure: Surface Magnetism and Spin Phenomena

O 88.13: Vortrag

Donnerstag, 19. März 2015, 18:00–18:15, MA 042

Forces during the manipulation of magnetic properties of individual molecules — •Christian Lotze, Olof Peters, Xianwen Chen, Benjamin W. Heinrich, and Katharina J. Franke — Freie Universität Berlin, Inst. f. Experimentalphysik, Arnimallee 14, 14195 Berlin

Molecular magnets are promising candidates for future electronic devices. As such they might be useful, for instance, in memory storage applications. Therefore a requirement is to have control over the molecules magnetic properties. In metal-organic complexes the latter are strongly influenced by the interaction of the metal center with the substrate and with its ligands.

Here, we characterize the effect of an additional Cl ligand approached to the center of an iron octaethylporphyrin (FeOEP) molecule adsorbed on a Au(111) surface, employing combined scanning tunneling and atomic force microscopy (STM & AFM). The proximity of a Cl-functionalized tip to the Fe center allows to tune the molecule’s spin state, magnetic anisotropy and interaction with the surface. This becomes apparent from the evolution of the tunneling spectra when the tip is approached to the molecule. At tip-molecule contact, we finally reach a regime of Kondo screening. We use simultaneous AFM measurements to detect a mechanical distortion of the molecule causing the change of magnetic properties.