Berlin 2008 – scientific programme
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DS: Fachverband Dünne Schichten
DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces
DS 18.2: Poster
Tuesday, February 26, 2008, 14:30–19:30, Poster A
Observation of spin switching in a chainlike supramolecular Fe (II) complex observed by STM/CITS — •M. Stocker1, A. Volkov1, M.S. Alam1, V. Dremov1, M. Ruben2, and P. Müller1 — 1Institut für Physik der Kondensierten Materie, Universität Erlangen-Nürnberg — 2Institut für Nanotechnologie, FZ Karlsruhe
Using a home-made microscope and custom-build control electronics and software we performed STM/CITS measurements on a chainlike supramolecular Fe (II) complex. The investigated complex shows spin crossover from a low-spin to a high-spin state in a temperature range between 250-350K. We investigated single and multiple polymer strands deposited onto HOPG surfaces. STM topography was able to resolve single monomers. The CITS technique at ambient conditions showed two distinct monomer species, one highly conducting, the other close to insulating. Furthermore we were able to observe spontaneous reversible switching between the two states. The different conductance can be attributed to the different spin states of the Fe (II) metal center. We discuss the results in terms of spin crossover theories.