1. Department of Electrical Engineering and Computer Science, South Dakota State University, Brookings, South Dakota57007, United States
2. Department of Materials Science and Engineering, University of Texas at Arlington, Arlington, Texas76019, United States
3. Department of Physics, South Dakota State University, Brookings, South Dakota57007, United States
4. NASA Glenn Research Center, Cleveland, Ohio44135, United States
5. Department of Mechanical Engineering, The University of Texas at Dallas, 800 W Campbell Rd, Richardson, Texas75080, United States