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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 Greber31Institute 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).

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