Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 39: Micro- and Nanostructured Magnetic Materials I
MA 39.2: Vortrag
Donnerstag, 29. März 2012, 09:45–10:00, EB 202
X-ray microdiffraction studies on complex magnetoelectric composites with defined microstructures — •Stjepan Hrkac1, Madjid Abes1, Christian Koops1, Christina Krywka1, Martin Müller1,2, Sören Kaps3, Rainer Adelung3, Olaf Magnussen1, and Bridget Murphy1 — 1Institut für experimentelle und angewandte Physik, CAU Kiel, Germany — 2Strukturforschung an Neuen Werkstoffen, Helmholtz Zentrum Geesthacht, Germany — 3Institut für Materialwissenschaft, CAU Kiel, Germany
Magnetoelectric (ME) composites, consisting of a piezoelectric (PE) and a magnetostrictive (MS) material, are of great interest for potential applications as highly sensitive ME sensors. A large ME response is only obtained if the lattice deformation induced by an external magnetic field in the MS material can be transferred effeciently to the PE material. The understanding of this mechanical coupling and its dependence on the component’s interface structure is still very rudimentary. This study aims at understanding this coupling by directly measuring the strain induced in the PE material in an external magnetic field employing X-ray diffraction methods. We present intrinsic strain maps of ZnO microrods (800 x 30 µ m2), grown by flame transportation synthesis, with a 200 nm MS (Fe90Co10)78Si12B10 (Metglas) coating, measured by the nanofocused X-ray beam provided by the Nanofocus Endstation of the MINAXS-Beamline at Petra III. The studies reveal pronounced compressive strain, which strongly varies across the sample, and a magnetic field induced strain relaxation.