1. Structure and Nano-/Micromechanics of Materials, Max Planck Institut für Eisenforschung GmbH, Max Planck Strasse-1, 40237 Düsseldorf, Germany
2. Laboratory for Nanometallurgy, Department
of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, CH-8093 Zürich, Switzerland
3. Empa, Swiss Federal Laboratories for Materials Science and Technology,
Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland
4. Department of Material Physics, University of Leoben, 8700 Leoben, Austria