Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Molecular Magnetism
MA 40.1: Vortrag
Donnerstag, 14. März 2013, 15:00–15:15, H23
Single molecule magnets from magnetic building blocks — •Wolfgang Kroener1, Alexa Paretzki2,3, Christian Cervetti2,4, Stephan Hohloch3, Stephan Rauschenbach4, Klaus Kern4, Martin Dressel2, Lapo Bogani2, and Paul Müller1 — 1Lehrstuhl für Experimentalphysik, Universität Erlangen — 21. Physikalisches Institut, Universität Stuttgart — 3Institut für Anorganische Chemie, Universität Stuttgart — 4Max Planck Institut für Festkörperforschung, Stuttgart
We present measurements of a basic set of magnetic building blocks that were rationally assembled, similar to magnetic LEGO bricks, in order to create a huge variety of magnetic behavior1. Using rare-earth centers and multipyridine ligands, fine-tuning of intra and intermolecular exchange interaction was demonstrated. We have investigated a series of molecules with monomeric, dimeric and trimeric lanthanide centers using SQUID susceptometry and Hall bar magnetometry. A home-made micro-Hall-probe magnetometer was used to measure magnetic hysteresis loops at mK temperatures and fields up to 17 T. All compounds show hysteresis below blocking temperatures of 3 to 4 K. The correlation of the assembly of the building blocks with the magnetic properties will be discussed.
1A. Paretzki et al. Nature Chemistry, submitted