1. Department of Physics, Gandhi Institute of Technology and Management (GITAM) University, Bengaluru, Karnataka 560034, India
2. Department of Physics, JNTUCEA, Anantapuramu, Andhra Pradesh 515002, India
3. Instituto de Fisica, Universidade Federal de Goias, Goiania 74690-900, Brazil
4. Delta Magnets Limited, Nashik, Maharashtra 422010, India