Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 76: Nanostructures at surfaces IV

O 76.4: Vortrag

Donnerstag, 29. März 2012, 16:45–17:00, MA 042

Magnetic nanowire arrays prepared by electrodeposition using AAO templates — •Nina Winkler, Jörn Leuthold, Martin Peterlechner, Yong Lei, and Gerhard Wilde — Institute of Materials Physics and Center for Nanotechnology, University of Münster, 48149 Münster, Germany

Regular magnetic nanowire arrays with large wire aspect ratios have possible applications, amongst others, in high density magnetic recording media and biological sensing of carbohydrates. Porous Anodic Alumina Oxide (AAO) is a versatile template for surface nanostructuring and in this talk, the fabrication of nanowire arrays by electrodeposition using AAO will be addressed. The AAO template enables control of regularity and shape of nanostructures by its pores which are hexagonally arranged and stand perpendicularly on an Aluminum substrate. Two different pretreatments of the AAO template will be presented to either remove or perforate the insulating alumina barrier layer between Al substrate and pores of the AAO template. Electrodeposition is applied using a potential pulse sequence to obtain nickel, iron, cobalt or FeNiP nanowire arrays. The structure of the nanowire arrays has been observed by SEM and TEM. The magnetic properties of the nanowire arrays have been characterized by Vibrating Sample Magnetometer (VSM) measurements and Magnetic Force Microscopy (MFM). The high regularity of a nanowire array is demonstrated using an image-based analysis tool which compares the arrangement of the wires to a mathematically perfect hexagonal pattern and therefore allows a quantitative analysis of the hexagonal regularity of the nanowire array.