1. Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
2. Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, United States
3. Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio 45433, United States
4. UES Inc., Beavercreek, Ohio 45432, United States
5. Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
6. Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, United States