Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Magnetic Particles / Clusters
MA 35.4: Vortrag
Mittwoch, 22. März 2017, 10:15–10:30, HSZ 101
Structural and magnetic properties of self-assembled 3D nanoparticle macrocrystals — •Michael Smik1, Genevieve Wilbs1, Mauricio Cattaneo1, Elisa Volkmann1, Emmanuel Kentzinger1, Stefan Mattauch2, Jörg Persson1, Ulrich Rücker1, Oleg Petracic1, and Thomas Brückel1 — 1Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — 2Jülich Centre for Neutron Science JCNS, Heinz Maier-Leibnitz Zentrum, 85747 Garching, Germany
Magnetic nanoparticle assemblies form a novel type of artificial material with properties that are not found in nature. We have succeeded in fabricating large 3D nanoparticle ‘macrocrystals’ using a novel centrifuge assisted sedimentation technique from commercially available spherical iron oxide nanoparticles. The assembly of macrocrystals up to 300-1000 µm in size was possible. Using small angle x-ray scattering (SAXS) at the new in-house instrument ’GALAXI’ (Gallium Anode Low-Angle X-ray Instrument) the supercrystalline structure and quality of ordering could be characterized. The magnetic properties were investigated by a variety of magnetometric methods including zero field cooled and field cooled curves as well as AC susceptibility. For a microscopic investigation of the magnetic ordering, small angle neutron scattering (SANS) was employed at the neutron reflectometer MARIA (MAgnetic Reflectometer with high Incidence Angle) at the Heinz Meier-Leibnitz Zentrum.