1. Department of Physics, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, Tamilnadu, India
2. School of Electrical Engineering Vellore Institute of Technology Vellore, Vellore 632014, Tamilnadu, India
3. Ceramic Composite Materials Laboratory, Department of Physics, Sri Krishnadevaraya University, Anantapuram, Andhra Pradesh 515003, India
4. Defence Metallurgical Research Laboratory Kanchanbagh, Hyderabad 5000058, India
5. Microwave Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India
6. Department of Physics, JNTUA College of Engineering, Anantapur 515002, India
7. Ceramic Composites Laboratory, Centre for Functional Materials, VIT, Vellore 632014, Tamilnadu, India