title: Probing the quality of Ni filled nanoporous alumina templates by magnetic techniques.
abstract: Pulsed electrodeposition prepared porous alumina templates with Ni nanowires pore filling ranged from 1 to 100%, depending on the alumina barrier-layer thickness, were probed by continuous wave ferromagnetic resonance at room temperature. For completely filled samples, a single resonance peak was observed in the whole range of angles between the applied magnetic field and normal to the sample plane. Its position was described by Kittel formula that takes into account shape anisotropy of individual Ni wires and dipolar interactions between them. For the samples with lower pore filling the effective anisotropy field decreased and the resonance linewidth in the perpendicular configuration increased. Also a quite intense second peak was observed at lower fields for these samples. These changes are associated with reduction of pore filling percentage that can lead to decrease of dipolar interactions between nanowires and to appearance of magnetic inhomogeneities inside wires.
authors.affiliation: IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de Física, Universidade do Porto, Rua Campo Alegro 687, 4169-007 Porto, Portugal.
authors.forename: C T
authors.initials: CT
authors.lastname: Sousa
authors.forename: D C
authors.initials: DC
authors.lastname: Leitão
authors.forename: M P
authors.initials: MP
authors.lastname: Proença
authors.forename: A
authors.initials: A
authors.lastname: Apolinário
authors.forename: A M
authors.initials: AM
authors.lastname: Azevedo
authors.forename: N A
authors.initials: NA
authors.lastname: Sobolev
authors.forename: S A
authors.initials: SA
authors.lastname: Bunyaev
authors.forename: Yu G
authors.initials: YG
authors.lastname: Pogorelov
authors.forename: J
authors.initials: J
authors.lastname: Ventura
authors.forename: J P
authors.initials: JP
authors.lastname: Araújo
authors.forename: G N
authors.initials: GN
authors.lastname: Kakazei