Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 14: Surface or Interface Magnetism
O 14.5: Talk
Monday, February 25, 2008, 16:15–16:30, MA 043
Bottom-up creation and adsorption of hybrid organic-inorganic magnetic molecules on metal substrates — •Daniel Wegner1, Mark Pederson2, Ryan Yamachika1, Yayu Wang1, Bart M. Bartlett3, Jeffrey R. Long3, and Michael F. Crommie1 — 1Department of Physics, University of California, Berkeley, and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA — 2Center for Computational Materials Science, Naval Research Laboratory, Washington, DC, USA — 3Department of Chemistry, University of California, Berkeley, CA, USA
Charge-transfer compounds of the type M[TCNE]x (M: transition-metal, TCNE: tetracyanoethylene) form an important group of molecule-based ferromagnets with potential applications due to their high Curie temperatures. Despite extensive studies the origin of magnetic coupling is not well understood due to a lack of sufficient structural characterization, largely attributed to disordered growth. Using a bottom-up approach, we have used a scanning tunneling microscope to arrange single V atoms and TCNE molecules to form charge transfer complexes of different sizes and geometries. By tunneling spectroscopy we prove chemical bonding as well as the emergence of magnetic properties. Special attention is given to the influence of the metallic substrate on the properties of TCNE and the implications for future organic-inorganic nanoscopic devices.