1. Department of Physics, Aligarh Muslim University, Aligarh 202002, India
2. UGC-DAE Consortium for Scientific Research, Indore 452001, India
3. Department of Physics, Federal University of Maranho, Av.dos Portugueses, 1966 Bacanga, Sao Luis-MA 65080-805, Brazil
4. Laboratory of Magnetic Materials, NFA, Institute of Physics, UnB, Brasilia DF 70910 900, Brazil