title: Enhanced magnetocrystalline anisotropy of Fe30Co70 nanowires by Cu additives and annealing.
abstract: The use of 3d transition metal-based magnetic nanowires (NWs) for permanent magnet applications requires large magnetocrystalline anisotropy energy (MAE), which in combination with the NWs' magnetic shape anisotropy yields magnetic hardening and an enhancement of the magnetic energy product. Here, we report on the significant increase in MAE by 125 kJ m(-3) in Fe30Co70 NWs with diameters of 20-150 nm embedded in anodic aluminum oxide templates by adding 5 at.% Cu and subsequent annealing at 900 K. Ferromagnetic resonance (FMR) reveals that this enhancement of MAE is twice as large as the enhancement of MAE in annealed, but undoped NWs. X-ray diffraction (XRD) analysis suggests that upon annealing the immiscible Cu in FeCo NWs causes a crystal reorientation with respect to the NW axis with a considerable distortion of the bcc FeCo lattice. This strain is most likely the origin of the strongly enhanced MAE.
authors.affiliation: Institute of Materials Science of Madrid, CSIC, E-28049 Madrid, Spain. Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, D-47057 Duisburg, Germany.
authors.forename: Ester M
authors.initials: EM
authors.lastname: Palmero
authors.forename: Ruslan
authors.initials: R
authors.lastname: Salikhov
authors.forename: Ulf
authors.initials: U
authors.lastname: Wiedwald
authors.forename: Cristina
authors.initials: C
authors.lastname: Bran
authors.forename: Marina
authors.initials: M
authors.lastname: Spasova
authors.forename: Manuel
authors.initials: M
authors.lastname: Vázquez
authors.forename: Michael
authors.initials: M
authors.lastname: Farle