Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Bio- Molecular Magnetism
MA 33.10: Vortrag
Donnerstag, 26. März 2009, 12:30–12:45, HSZ 103
Controlling the magnetic coupling of Fe-porphyrin molecules to ferromagnetic films: a temperature-dependent XMCD investigation — •Matthias Bernien1, Jorge Miguel1, Claudia Weis2, Marten Piantek1, Xiaoying Xu1, Philipp Eckhold1, Julia Kurde1, Klaus Baberschke1, Wolfgang Kuch1, and Heiko Wende2 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin — 2Fachbereich Physik, Experimentalphysik - AG Wende and Center for Nanointegration (CeNIDE), Universität Duisburg-Essen, Lotharstrasse 1, D-47048 Duisburg
Metal complexes on surfaces are the topic of intensive scientific investigations, since the properties of their central ion, determined by the adjacent ligands, can be widely tuned by the chemical design of the molecule. When paramagnetic porphyrin molecules are deposited onto ferromagnetic substrates, the spin of the metal center aligns parallel to the magnetization of the substrate. Tuning the molecule-substrate interaction would be an important step towards the realization of a surface-mounted molecular spintronic device. Here we have realized different magnetization directions and coupling strengths by choice of the substrate. We have determined the coupling strength between submonolayers of Fe octaethylporphyrins and ferromagnetic substrates by detailed temperature-dependent X-ray magnetic circular dichroism measurements. The vision of tailoring the magnetic coupling between the porphyrin molecules and the ferromagnetic substrates will be discussed.
Supported by BMBF (05 KS4 KEB/5) and DFG (SFB 658).