title: Variations in magnetic properties of nanostructured nickel.
abstract: The magnetic properties of carbon nanotube encapsulated nickel nanowires (C.E. nanowires of diameter to approximately 10 nm), and its comparison to other forms of Ni are carried out in this work. The saturation magnetization (Ms) and coercivity (Hc) for C.E. nanowires are 1.0 emu/g and 230 Oe. The temperature dependence of coercivity follows T0.77 dependence indicating a superparamagnetic behavior. The field-cooled and zero-field-cooled plots indicate that the blocking temperature (T(B)) to approximately 300 K. These altered magnetic properties of C.E. nanowires are mainly due to the nanoscale confinement effect from carbon nanotube encapsulation. The shape and magnetic environment enhance the total magnetic anisotropy of C.E. nanowires by a factor of four.
authors.affiliation: Department of Physics, Indian Institute of Science, Bangalore 560012, India.
authors.forename: Paramita Kar
authors.initials: PK
authors.lastname: Choudhury
authors.forename: S
authors.initials: S
authors.lastname: Banerjee
authors.forename: S
authors.initials: S
authors.lastname: Ramaprabhu
authors.forename: K P
authors.initials: KP
authors.lastname: Ramesh
authors.forename: Reghu
authors.initials: R
authors.lastname: Menon