1. Laboratory for Mechanics of Materials and Nanostructures, Empa—Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland
2. Nanoscale Structures
and Microscopic Analysis, Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany
3. Faculty of Physics and Applied Computer Science, AGH University of Science and Technology Krakow, Al. Mickiewicza 30, 30-059 Kraków, Poland
4. Institute of Physics Gleb Wataghin, University of Campinas, Rua Sergio
Buarque de Holanda 777 Cidade Universitaria, 13083-859 Campinas-SP, Brazil