Berlin 2015 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 41: Electron Microscopy

MM 41.4: Talk

Wednesday, March 18, 2015, 16:30–16:45, TC 006

Crystallization of amorphous FeNiP nanowire arrays studied by in-situ TEM — Nina Winkler, •Martin Peterlechner, and Gerhard Wilde — Institut für Materialphysik, Westfälische-Wilhelms-Universität Münster, NRW

Nano-scaled magnetic materials are in focus of basis research since decades, and of remarkable technical importance. In this work, an array of amorphous soft magnetic nanowires was successfully processed using porous Anodic Alumina Oxide (AAO) templates. This enables to study the crystallization in confined volumes and to control the regularity and shape of the nanostructures via the AAO pores which are uniform in length and diameter. Fe40Ni40P20 (at. %) nanowire arrays were processed into the AAO pores by electrodeposition. Differential scanning calorimetry (DSC) of a likewise processed thin film shows a glass transition. Upon in-situ annealing in the transmission electron microscope (TEM) the microstructural evolution can be detected. Crystallization kinetics includes long range diffusion and a high nucleation rate. Annealing at temperatures above the crystallization temperature follows a phase separation of FeNiP in multilayers of FeNi and FeNiP phases. The impact of different heating rates on the phase evolution is studied by DSC. The obtained magnetic properties are characterized by a Vibrating Sample Magnetometer (VSM).