Affiliation: | a Nanomagnetism Lab, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea b Department of Physics, Vivekanand College, Aurangabad, Maharashtra 431004, India c Department of Physics, Jawaharlal Nehru Technological University Hyderabad, College of Engineering, Nachupally (Kondagattu), Karimnagar-Dist., 505 501, A.P., India |