Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Bio- and Molecular magnetism
MA 16.8: Vortrag
Dienstag, 17. März 2015, 11:30–11:45, EB 202
X-ray induced demagnetization of single-molecule magnets — •Jan Dreiser1,2, Rasmus Westerström2,3,4, Cinthia Piamonteze2, Frithjof Nolting2, Stefano Rusponi1, Harald Brune1, Shangfeng Yang5, Alexey Popov6, Lothar Dunsch6, and Thomas Greber3 — 1Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland — 2Swiss Light Source, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland — 3Physik-Institut, Universität Zürich, 8057 Zürich, Switzerland — 4Department of Physics and Astronomy, Uppsala University, 751 20 Uppsala, Sweden — 5Hefei National Laboratory for Physical Sciences at Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China — 6Department of Electrochemistry and Conducting Polymers, Leibniz Institute of Solid State and Materials Research, 01069 Dresden, Germany
X-ray magnetic circular dichroism measurements on the endohedral single-molecule magnet DySc2N@C80 [1] at the Dy M4,5 edges exhibit a shrinking of the hysteresis opening with increasing x-ray flux. Our data reveal that this effect can neither be explained by irreversible structural damage nor by a homogeneous temperature rise due to x-ray absorption. The observed large demagnetization cross sections indicate that the resonant absorption of one x-ray photon induces the demagnetization of many molecules [2].
[1] Westerström et al., J. Am. Chem. Soc. 134, 9840 (2012).
[2] Dreiser et al., Appl. Phys. Lett. 105, 032411 (2014).