1. Materials Science and Nanotechnology Department, Faculty of Postgraduate Studies for Advanced Sciences, Beni-Suef University, 62511 Beni-Suef, Egypt
2. Department of Physics, Faculty of Science, Fayoum University, 63514 Fayoum, Egypt
3. National University of Science and Technology MISiS, 119049 Moscow, Russia
4. Lomonosov Moscow State University, 119991 Moscow, Russia
5. Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden
6. Department of Applied Physics and Astronomy, University of Sharjah, P. O. Box 27272 Sharjah, United Arab Emirates