1. Department of Physics, Government College University, Faisalabad 38000, Pakistan
2. Department of Physics, The University of Lahore, Lahore 54000, Pakistan
3. Department of Materials Science and Engineering, The University of Sheffield, Sheffield S1 3JD, U.K.
4. Biophysics Group, Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, U.K.
5. UCL Healthcare Biomagnetics and Nanomaterials Laboratories, 21 Albemarle Street, London W1S 4BS, U.K.
6. Department of Chemistry College of Sciences, King Khalid University, P.O. Box 9004, Abha 61412, Saudi Arabia
7. Department of Physics, Government College Women University, Faisalabad 38000, Pakistan