Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)

O 55.71: Poster

Mittwoch, 27. Februar 2008, 18:30–19:30, Poster F

Growth Study of Salene Molecules on NaCl(001) — •Knud Lämmle, Alexander Schwarz, and Roland Wiesendanger — Institut für Angewandte Physik, Jungiusstrasse 11a, 20355 Hamburg

Combining magnetism with the properties of organic molecules opens new options to develop unique materials. An example would be a transparent magnet. For our investigation we choose Salenes which exhibit a metallic centre and a planar structure. By exchanging the centre atoms, it is possible to tune the magnetic properties. Moreover, several molecules can be attached to each other to study the intramolecular magnetic coupling between the metallic centres via chemical bonds in such molecules. As a first step we study the growth of Co-Salene molecules using atomic force microscopy. To investigate these molecules without hybridisation effects we use the large bandgap insulator NaCl(001) as substrate. The molecules were evaporated with a homebuilt Knudsen cell at temperatures around 220 °C, while the evaporation rate was monitored by a quartz crystal microbalance. At low coverages the molecules decorate step edges only. At increased coverages the molecules form wires which also grow across large terraces. Increasing the amount of evaporated material further leads to network formation. We observed that the wires grow primarily oblique to the crystallographic axes.