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MA: Fachverband Magnetismus

MA 43: Micro- and Nanostructured Magnetic Materials IV

MA 43.5: Vortrag

Mittwoch, 16. März 2011, 18:00–18:15, HSZ 103

Fabrication and investigation of regular arrays of Fe, Ni and Co nanowires using template synthesizing technique — •Nina Winkler, Yong Lei, and Gerhard Wilde — Institute of Materials Physics and Center for Nanotechnology, University of Münster, 48149 Münster, Germany

Regular arrays of magnetic nanowires with a high aspect ratio have possible applications in high density magnetic recording media. Basic knowledge about magnetism may be obtained from these nanowire arrays as transition of multi-domain to single-domain wires occurs at the nanoscale. Modified Porous Alumina Membranes (PAMs) with pore diameters from 20 to 80 nm are well suited as templates for electrodeposition due to their high pore regularity. The pores of the PAM were filled with nickel, iron, cobalt, and multilayer structures of these metals, resulting in different metallic nanowire arrays. The deposition conditions for growing metallic nanowires are investigated in detail. The homogeneous structure and morphology of the template-prepared nanowire arrays is observed by SEM and TEM. The TEM and X-ray measurements indicate that the crystalline structure is either polycrystalline or amorphous depending on the deposition conditions. The magnetic properties of the nanowire arrays are investigated with vibrating sample magnetometry , which shows a preferential direction of magnetization along the wire axis due to the high aspect ratio of the nanowires. The wire interaction in the array is observed qualitatively with magnetic force microscopy.