1. Department of Physics Ahmednagar College Ahmednagar 414001, M.S. India
2. Department of Physics National Dong Hwa University Hualien 97401 Taiwan
3. Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan
4. Smart Materials Research Laboratory Department of Physics, Shivaji University Kolhapur 416004, M.S. India
5. Functional Materials Research Laboratory, School of Physical Sciences Punyashlok Ahilyadevi Holkar Solapur University Solapur 413255, M,S. India