Regensburg 2013 – scientific programme
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DS: Fachverband Dünne Schichten
DS 29: Focus Session: Organic Materials for Spintronics: From Spinterface to Devices (jointly with HL, MA, O)
DS 29.8: Talk
Thursday, March 14, 2013, 13:00–13:15, H32
Influence of surface interaction on the properties of single-molecule-magnets — •David Klar1, Andrea Candini2, Bernhard Krumme1, Loic Joly3, Svetlana Klyatskaya4, Jean-Paul Kappler3, Mario Ruben3,4, and Heiko Wende1 — 1Fakultät für Physik und CENIDE, Universität Duisburg-Essen — 2Centro S3 Modena, Istituto Nanoscienze - CNR — 3Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg — 4Institute of Nanotechnology, Karlsruhe Institute of Technology
Due to the consecutive downsizing of devices, single-molecule-magnets as building blocks for spintronic applications are of high interest for actual research. The remanent behavior, caused by the single-ion anisotropy, of TbPc2 molecules in bulk samples at less than 5 K is reported in the literature. Our goal is to investigate and to understand the influence of the surface on the properties of the TbPc2 molecules deposited onto a substrate. Therefore we study submonolayer coverages of TbPc2 molecules on ferromagnetic surfaces like Ni, and on a very inert surface of highly oriented pyrolytic graphite (HOPG) that should maintain the properties of isolated molecules. By XAS and XMCD we analyze the element specific magnetic and electronic properties. The low interaction with the HOPG surface hardly affects the magnetic properties of the molecules and we were able to observe a remanent magnetization, but only at very low temperatures (T < 4 K). On the Ni surface an indirect exchange leads to an antiferromagnetic coupling between the molecules and the surface. As a result, we obtained a remanent magnetization at higher temperatures (T ≈ 100 K).