Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 7: Micro and Nanostructured Magnetic Materials II

MA 7.8: Talk

Monday, February 25, 2008, 17:00–17:15, EB 301

On the aspect ratio and packing factor dependence of magnetostatic interactions in densely-packed Co nanowire arrays — •Giray Kartopu¹, Orhan Yalçin², Ali Cemil Başaran³, Morten Madsen⁴, Horst-Günter Rubahn⁴, and Mohammed Es-Souni¹ — ¹Institute for Materials and Surface Technology, University of Applied Science of Kiel, Grenzstrasse 3, 24149, Kiel, Germany — ²Department of Physics, Bozok University, 66500 Yozgat, Turkey — ³Department of Physics, Gebze Institute of Technology, 41400 Gebze, Kocaeli, Turkey — ⁴Mads Clausen Institute, NanoSYD, University of Southern Denmark, Alsion 2, DK-6400, Sønderborg, Denmark

Densely-packed and ordered cobalt nanowire (NW) arrays with aspect ratio (wire legth/diameter) varying between 5-250 have been fabricated via electrodeposition into porous alumina templates (<60 nm channel diameter). For a fixed diameter the NW length was controlled by monitoring the total deposited charge, and for high-aspect ratio NWs with variable diameters the template pores were adjusted by a post-anodization wet etching. Room temperature magnetization measurements (M-H loops) show that the magnetic behaviour of Co NW arrays is governed largely by aspect ratio- or packing factor-dependent magnetostatic wire-wire interactions.