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Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 70: Correlated Electrons: Spin Systems and Itinerant Magnets – Chiral Magnets (jointly with MA)

TT 70.1: Vortrag

Mittwoch, 18. März 2015, 18:00–18:15, H 3005

Gracing incidence small angle neutron scattering of incommensurate magnetic structures in MnSi thin filmsBirgit Wiedemann1, Shilei Zhang2, Yury Khaydukov3,4, Thorsten Hesjedal2, Olaf Soltwedel3,4, Thomas Keller3,4, Sebastian Mühlbauer5, •Alfonso Chacon1, 5, Christian Pfleiderer1, and Peter Böni11Physik Department, Technische Universität München, Germany — 2Clarendon Laboratory, Department of Physics, University of Oxford, UK — 3Max-Planck-Institut für Festkörperforschung, Germany — 4Max Planck Society, Outstation at FRM-II, Germany — 5Forschungsneutronenquelle Heinz Maier Leibnitz, Technische Universität München, Germany

The topological stability of skyrmions in bulk samples of MnSi and the observation of spin transfer torque effects at ultra-low current densities have generated great interest in skyrmions in chiral magnets as a new route towards next generation spintronics devices. Yet, the formation of skyrmions in MBE grown thin films of MnSi reported in the literature is highly controversial. We report gracing incidence small angle neutron scattering (GISANS) of the magnetic order in selected thin films of MnSi grown by state of the art MBE techniques. In combination with polarised neutron reflectometry (PNR) and magnetisation measurements of the same samples our data provide direct reciprocal space information of the incommensurate magnetic order, clarifying the nature of magnetic phase diagram.

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