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MM: Fachverband Metall- und Materialphysik

MM 23: Electron Microscopy I - Nanomaterials

MM 23.2: Talk

Tuesday, April 1, 2014, 10:30–10:45, IFW D

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

In this work, an amorphous soft magnetic material is studied in confined dimensions regarding its crystallization behavior. Therefore, porous Anodic Alumina Oxide (AAO) is used because it enables the control of regularity and shape of nanostructures via its pores which are uniform in length and uniform in diameter. The fabrication of amorphous nanowire arrays by electrodeposition using AAO will be addressed. Upon in-situ annealing in the transmission electron microscope (TEM) the microstructural evolution could be monitored. Long range diffusion was observed following a phase separation of FeNiP in multilayers of FeNi and FeNiP phases. The impact of heating rates on the phase evolution is studied by controlled annealing with different heating rates of the FeNiP nanowires in atmosphere using a Differential Scanning Calorimeter (DSC). The magnetic properties of the nanowire arrays have been characterized with a Vibrating Sample Magnetometer (VSM). The results will be discussed with respect to the different microstructures of the nanowire arrays caused by the different thermal treatments.