1. Department of Physics and Astronomy, University of Delaware, Newark, Delaware19716, United States
2. Department of Materials Science and Engineering, University of Delaware, Newark, Delaware19716, United States
3. Lomare Technologies Ltd., 6 London Street, LondonEC3R 7LP, United Kingdom
4. Departamento de Física, Universidad Nacional de Colombia, Bogotá D.C.110851, Colombia
5. Department of Physics, Georgetown University, Washington, District of Columbia20057, United States
6. Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
7. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee37831, United States