Affiliation: | 1.Department of Physics, Faculty of Science, Tanta University, Tanta, 31527, Egypt ;2.Department of Materials Physics, Eötvös Loránd University, P.O.B. 32, Budapest, 1518, Hungary ;3.School of Materials Science and Engineering, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul, 136-702, Republic of Korea ; |