1. Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education
2. Dalian University of Technology
3. Dalian 116024
4. P. R. China
5. Institute of Photoelectric Nanoscience and Nanotechnology
6. Department of Electrical and Computer Engineering
7. Center for Materials for Information Technology
8. The University of Alabama
9. Tuscaloosa
10. USA
11. Department of Material Science and Engineering
12. Frederick Seitz Material Research Laboratory
13. University of Illinois at Urbana-Champaign
14. Urbana