Parts | Days | Selection | Search | Updates | Downloads | Help

MA: Fachverband Magnetismus

MA 40: Molecular Magnetism

MA 40.1: Talk

Thursday, March 14, 2013, 15:00–15:15, H23

Single molecule magnets from magnetic building blocks — •Wolfgang Kroener¹, Alexa Paretzki^2,3, Christian Cervetti^2,4, 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