1. Laboratory of LBGIM, Research Team-Nanomaterials Physics, University Hassan 2, ENS- Casablanca, Casablanca, Morocco;
2. Physics Department, Faculty of Sciences and Technics, University Hassan 1st, Settat, Morocco;
3. Physics Department Faculty of Sciences Kenitra, University Ibn Toufail, Kénitra, Morocco;
4. Department of Mechanical Engineering, ENSET, University Mohammed V-Souissi, Rabat Instituts, Rabat, Morocco