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Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Bio- and Molecular Magnetism II

MA 21.5: Talk

Tuesday, March 15, 2011, 12:00–12:15, HSZ 401

Magnetization measurements of a {MnMn6}(CH3H5O3)3 single-molecule magnet — •Klaus Gieb1, Wolfgang Kroener1, Carl-Georg Freiherr von Richthofen2, Thorsten Glaser2, and Paul Müller11Department of Physics and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Germany — 2Fakultät für Chemie - Lehrstuhl Anorganische Chemie I, Universität Bielefeld, Germany

We present low-temperature magnetization measurements of a novel {MnMn6}(CH3H5O3)3 complex. The measurements at mK temperatures were carried out with a home-made micro-Hall-probe magnetometer. A commercial SQUID magnetometer was used to collect the susceptibility data. Most of the 3d-ion based single-molecule magnets, known up to now, have a low-lying spin ground state, well separated from the first excited state. In contrast to this property, the first exited state of the present complex can already be reached with moderate magnetic fields. Amazingly, loop magnetization measurements show hysteresis for both the ground state and the first exited state. This leads to a double hysteresis in the low temperature magnetization measurements. The blocking temperature was found to be TB ≈ 1.3 K.

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