1. Department of Physics, Annamalai University, Chidambaram, India
2. Department of Engineering Physics, Faculty of Engineering and Technology, Annamalai University, Chidambaram, India
3. Department of Paleomagnetism, CSIR-National Geophysical Institute, Hyderabad, India
4. Centre for Nano Technology and Advanced Biomaterials (CENTAB) and School of Electrical and Electronics Engineering (SEEE), SASTRA Deemed University, Thanjavur, India