Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Tuesday: Nanostructures
O 41.4: Poster
Dienstag, 2. April 2019, 18:00–20:00, Poster D
X-Ray Reflectivity Measurements of FeCo/TiN Magnetostructures — •Henning Vogt1, Philipp Jordt1, Jan-Philipp Kress1, Niklas Wolff2, Lorenz Kienle2, Stefan Beierle3, Olaf M. Magnussen1, and Bridget M. Murphy1 — 1Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24098 Kiel, Germany — 2Institute of Material Sciences, Kiel University, Kaiserstr. 2, 24143 Kiel, Germany — 3Institute of Applied Materials – IAM-AWP, KIT Karlsruhe, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
FeCo/TiN magnetostructures are strong canidates as robust biomagnetic sensors. FeCo has desirable magnetic properties, but loses them in thick layers. By applying alternating layers of FeCo and TiN—a material known for its hardness and corrosion resistance—the FeCo is epitaxially stabilized and keeps its magnetic properties. The samples consist of hundreds of layers of a few monolayers thickness on a silicon wafer grown by magnetron sputtering. Their atomic structure has been explored using TEM to obtain local structural information and by X-ray diffraction to investigate the whole multilayer stack.
X-ray reflectivity has revealed the structure perpendicular to the surface showing that a regular layering of FeCo/TiN forms a superlattice. Sharp peaks corresponding to the layer period are observed. Further information including thickness, roughness and the electron density of each layer is obtained by modelling the reflectivity. We show that annealing the samples leads to lowering of the electron densities of the topmost layers, suggesting oxidation or atomic diffusion.