1. Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany.
2. Fraunhofer Institute for Mechanics of Materials, Walter-Hülse-Straße 1, D-06120 Halle, Germany.
3. Institute of Physics–Nuclear Magnetic Resonance Group, Martin-Luther-University Halle-Wittenberg, Friedemann-Bach-Platz 6, D-06108 Halle, Germany.
4. Microscopy Unit Biocenter, Martin-Luther-University Halle-Wittenberg, Weinbergweg 22, D-06120 Halle, Germany.