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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 9: Microscopy and Tomography with X-ray Photons, Electrons, Ions and Positron
KFM 9.9: Talk
Wednesday, March 29, 2023, 11:55–12:15, POT 106
Strain Distribution in Au/ZnO Microstructures for bio-magnetic sensing utilizing Scanning X-Ray Nano Diffraction and Coherent X-Ray Diffraction Imaging — •Philipp Jordt1, Niklas Wolff1, Stjepan Hrkac2, Jorit Gröttrup1, Sindu Shree1, Di Wang3, Anton Davydok4, Christina Krywka4,1, Ross Harder5, Christian Kübel3, Oleg Shpyrko2, Rainer Adelung1, Olaf Magnussen1, Lorenz Kienle1, and Bridget Murphy1 — 1Kiel University, Germany — 2UCSD, USA — 3KNMF, KIT, Germany — 4Hereon, Germany — 5XSD, ANL, USA
Magnetic field sensors based on piezoelectric and magnetostrictive materials are a possible path to a new generation of sensors, capable of detecting bio-magnetic fields from human physiology at room temperature in an unshielded environment. A huge hurdle are the very low field strengths of these signals. One approach to further enhance the sensitivity is employing the piezotronic effect, which arises from the combination of a piezoelectric material and a Schottky contact. Here, a study on the strain distribution in ZnO nano and microrods coated with gold is presented. Scanning X-ray nano diffraction mapped the 2 dimensional strain distribution across 30-50 µm rods together with insitu current-voltage curves. It is demonstrated that the gold coating and the resulting Schottky contact has a direct impact on the lattice parameters in vicinity of the Au/ZnO interface and further, that the crystal quality of the ZnO is immensely influential on the properties of the Schottky contact. The full 3D strain distribution inside a 1 µm rod was characterized by coherent X-ray diffraction imaging.