Electroplating and magnetostructural characterization of multisegmented Co54Ni46/Co85Ni15 nanowires from single electrochemical bath in anodic alumina templates
1 Departamento de Física, Universidad de Oviedo, Calvo Sotelo s/n, Oviedo 33007, Spain
2 Institute of Applied Physics, University of Hamburg, Jungiusstraβe 11, Hamburg 20355, Germany
3 Centro de Investigación de Ciencias Físico-Matemáticas/Facultad de Ciencias Físico-Matemáticas, Universidad Autónoma de Nuevo León, Monterrey, Nuevo Leon 66450, Mexico
4 Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, San Nicolás de los Garza, Monterrey, Nuevo Leon 66450, Mexico
5 Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
Nanoscale Research Letters 2013, 8:263 doi:10.1186/1556-276X-8-263Published: 4 June 2013
Highly hexagonally ordered hard anodic aluminum oxide membranes, which have been modified by a thin cover layer of SiO2 deposited by atomic layer deposition method, were used as templates for the synthesis of electrodeposited magnetic Co-Ni nanowire arrays having diameters of around 180 to 200 nm and made of tens of segments with alternating compositions of Co54Ni46 and Co85Ni15. Each Co-Ni single segment has a mean length of around 290 nm for the Co54Ni46 alloy, whereas the length of the Co85Ni15 segments was around 430 nm. The composition and crystalline structure of each Co-Ni nanowire segment were determined by transmission electron microscopy and selected area electron diffraction techniques. The employed single-bath electrochemical nanowire growth method allows for tuning both the composition and crystalline structure of each individual Co-Ni segment. The room temperature magnetic behavior of the multisegmented Co-Ni nanowire arrays is also studied and correlated with their structural and morphological properties.