1 Physics Department, Faculty of Science, Menoufia University Menoufia Shebin El-Koom 32511 Egypt mohamed.nawwar@science.menofia.edu.eg.
2 Spectroscopy Department, Physics Research Institute, National Research Centre 33 El Bohouth St., Dokki Giza 12622 Egypt.
3 Physics Department, Faculty of Science, Kafrelsheikh University KafrelSheikh 33516 Egypt.
4 Electronic & Magnetic Materials Department, Advanced Materials Institute, Central Metallurgical Research & Development Institute (CMRDI) Helwan-Cairo 11421 Egypt.
5 Electronic Materials Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City) New Borg El-Arab City Alexandria 21943 Egypt akashyout@srtacity.sci.eg.