1. Institute of Nanotechnology (INT); Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 Eggenstein-Leopoldshafen 76344 Germany
2. Institute for Applied Physics; Karlsruhe Institute of Technology (KIT); Wolfgang-Gaede-Straße 1 Karlsruhe 76131 Germany
3. Herbert Gleiter Institute of Nanosciences; Nanjing University of Science and Technology; 200 Xiao Ling Wei Street Nanjing 210094 China
4. Joint Research Laboratory Nanomaterials (KIT and TUD); Technische Universität Darmstadt (TUD); Jovanka-Bontschits-Straße 2 Darmstadt 64287 Germany