Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 22: Nanostructures at Surfaces II

O 22.9: Talk

Monday, March 11, 2013, 18:00–18:15, H45

Evolution of microstructure and magnetic properties of amorphous FeNiP nanowire arrays upon annealing — •Nina Winkler, Martin Peterlechner, and Gerhard Wilde — Institute of Materials Physics, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm Str. 10, 48149 Münster, Germany

Amorphous soft magnetic materials are suitable for application in high frequency, high power conversion and many further research fields. In this work, the fabrication of amorphous FeNiP nanowire arrays with large aspect ratios using porous Anodic Aluminum Oxide (AAO) templates will be presented.

The AAO template exhibits high hexagonal regularity of cylindrical pores which are perpendicularly arranged with respect to the Al substrate plane. The pore diameters used for the fabrication are 20 nm to 250 nm with lengths up to 40 μm. FeNiP nanowire arrays are prepared by filling the AAO pores via electrodeposition using a potential pulse sequence. The electrodeposition parameters are analyzed via cyclic voltammetry. The structure of the nanowire arrays has been characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The magnetic properties of the nanowire arrays have been investigated by Vibrating Sample Magnetometer (VSM) measurements.

Fully amorphous FeNiP nanowires were obtained. Upon in-situ annealing in the TEM, long range diffusion leading to crystallization was observed, which naturally also triggered changes of the magnetic properties.