1. Department of Physics, Martin Luther University Halle; 06099 Halle Germany
2. Department of Physics, Faculty of Science, Minia University; 61519 Minia Egypt
3. Technische Universität Dresden, Faculty of Mechanical Science and Engineering, Institute of Materials Science; 01069 Dresden Germany
4. Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Branch Lab; 01277 Dresden Germany