Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 16: Magnetic Particles / Clusters II
MA 16.8: Talk
Tuesday, March 27, 2012, 11:15–11:30, EB 202
Mn4 clusters covalently bonded to carbon nanotubes — •Carola Meyer1, Robert Frielinghaus1, Anna-Katharina Saelhoff1, Claire Besson1, Henrik Flötotto1, Lothar Houben2, Paul Kögeler1, and Claus M. Schneider1 — 1Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich and JARA Jülich Aachen Research Alliance, 52425 Jülich, Germany — 2Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich and Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, 52425 Jülich, Germany
Depending on the coordination, manganese polymetallic complexes form single molecule magnets (SMMs). The exchange coupling between the Mn atoms is mediated by the bridging ligands. Therefore, ligand exchange can be used to change the magnetic properties of such Mn SMMs. Carbon nanotubes (CNTs), on the other hand, are expected to possess large spin coherence lengths and long spin relaxation times. Thus, spin transport through CNTs could be used to probe the magnetic properties of attached magnetic molecules. Here, we present the functionalization of carbon nanotubes (CNTs), which provide a 1-dimensional template for the alignment of molecules, with Mn4 complexes. Raman spectroscopy is used to show the successful covalent bonding using ligand exchange with the oxidized CNTs. Transmission electron microscopy including elemental analysis by EDX and EELS reveals the functionalization on a molecular level. Finally, the changes in the magnetization behavior of the Mn4 complexes bonded to the CNTs are analyzed using data obtained in SQUID measurements.