1. Advanced Magnetics Group Defence Metallurgical Research Laboratory Hyderabad 500 0058 India
2. Department of Sciences and Humanities Matrusri Engineering College Saidabad Hyderabad 500 059 India
3. Department of Physics Amrita Vishwa Vidyapeetham Amritapuri 690525 India
4. Nanotechnology Research Centre SRM University Kattankulathur Tamil Nadu 603 203 India