1. Applied Physics, Division of Materials Science, Department of Engineering Science and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
2. Department of Physics and Materials Science, University of Luxembourg, Esch-sur-Alzette L-1511, Luxembourg
3. Department of Engineering Mathematics and Physics, Faculty of Engineering, Cairo University, Giza 12211, Egypt
4. Department of Physics, Faculty of Sciences and Humanity Studies, Huraimla, Shaqra University, Shaqra, Saudi Arabia