1. Department of Materials Engineering; Indian Institute of Science; Bangalore- 560012, Karnataka India
2. Department of Physics; Osmania University; Hyderabad- 500 007, Telangana India
3. Department of Physics; Mekelle, University; Mekelle Ethiopia
4. International and Inter University Centre for Nanoscience and Nanotechnology; Mahatma Gandhi University; Kottayam- 686 560, Kerala India
5. School of Chemical Sciences; Mahatma Gandhi University; Kottayam- 686 560, Kerala India
6. School of Pure and Applied Physics; Mahatma Gandhi University; Kottayam- 686 560, Kerala India