1. Herbert Gleiter Institute of Nanoscience School of Material Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China
2. Institute of Physics Chinese Academy of Sciences Beijing 100190 China
3. Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China
4. Institute of Nanotechnology Karlsruhe Institute of Technology 76021 Karlsruhe Germany