1. Talladega College, Department of Physics, 627 West Battle Street, Talladega, Alabama 35610, United StatesbAlabama A&M University, Material Science Group, Department of Physics, Chemistry and Mathematics, 4900 Meridian Street, Normal, Alabama 35762, United
2. Alabama A&M University, Material Science Group, Department of Physics, Chemistry and Mathematics, 4900 Meridian Street, Normal, Alabama 35762, United States
3. Center for Nanophase Material Science, Oak Ridge National Laboratory, Bethel Valley Road, Oak Ridge, Tennessee 37831, United States
4. NASA-Marshall Space Flight Center, Sensors Group, Redstone Arsenal, Huntsville, Albama 35811, United States