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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 Brückel11Jülich 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.

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