Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Organic/bio Molecules on Metal Surfaces I

O 6.1: Vortrag

Montag, 31. März 2014, 10:30–10:45, TRE Phy

Deposition and Characterization of Large Magnetic Molecules on Surfaces — •Judith Niedenführ¹, Bastian Feldscher², Jan-Philipp Broschinski², Thorsten Glaser², Andrei Postnikov³, and Daniel Wegner¹ — ¹Westfälische Wilhelms-Universität, Münster, Germany — ²Universität Bielefeld, Bielefeld, Germany — ³Université de Lorraine, Metz, France

A key to building functional devices on the basis of single molecule magnets (SMMs), be it for potential high-density memory storage or molecular-electronics applications, is the ability to deposit and manipulate these nanomagnets on surfaces in a controllable and reproducible way. The typical evaporation process is not applicable, because it would lead to dissociation of these large organic molecules. We used two different unconventional preparation techniques, namely pulse injection and rapid heating, for in-situ deposition of the Cu₃-triplesalen complex onto a Au(111) surface. These complexes are the building blocks for a new generation of promising SMMs, which combine a high-spin ground state with a large magnetic anisotropy. The comparison of both techniques allows us to evaluate their advantages and drawbacks. The Cu₃-triplesalen molecules have been studied using a combination of scanning tunneling microscopy (STM) and spectroscopy (STS). We discuss details of the electronic structure and its consequences on the internal spin coupling and compare these with first-principle calculations within the framework of the density-functional theory. The comparison is also done for the slightly modified Cu₃-triplesalalen complex which is designed to exhibit an enhanced ferromagnetic coupling.