1. Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, Seri Iskandar, 32610 Perak, Malaysia
2. Department of Physics, Al-Qalam University, Katsina, Katsina PMB 2137, Nigeria
3. Department of Electrical and Electronic Engineering, Universiti Teknologi PETRONAS, Seri Iskandar, 32610 Perak, Malaysia
4. Dept of Physics and Astronomy, University of Tennessee, 401 Nielsen Physics Building and Joint Institute for Materials Research 1408 Circle Drive Room 219 2641 Osprey Way, Knoxville, TN 37996 Tennessee, USA
5. Department of Physics, Universiti Putra Malaysia, Serdang, 43400 Selangor, Malaysia
6. Institute of Advanced Technology, Universiti Putra Malaysia, Serdang, 43400 Selangor, Malaysia
7. Micro and Nanofabrication Department, International Iberian Nanotechnology Laboratory, 4715-330 Braga, Portugal
8. ImViA EA 7535, Team IFTIM, Université de Bourgogne, 21000 Dijon, France
9. Department of Physics, Faculty of Science, Usmanu Danfodiyo University Sokoto, PMB 2346 Sokoto, Nigeria