Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 6: Magnetic nanoparticles (joint session MA/CPP)
CPP 6.4: Vortrag
Montag, 12. März 2018, 10:15–10:30, H 0112
Magnetic behavior of single- and polycrystalline nanoparticle superlattices — •Michael Smik1, Genevieve Wilbs1, Mauricio Cattaneo1, Elisa Volkmann1, Emmanuel Kentzinger1, Stefan Mattauch2, Ulrich Rücker1, Oleg Petracic1, and Thomas Brückel1 — 1Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institut (PGI-4), JARA-FIT, 52425 Jülich, GERMANY — 2Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ, Lichtenbergstr. 1, 85747 Garching, Germany
Magnetic nanoparticle (NP) assemblies form a novel type of artificial material which hold the promise to display 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 NP. The assembly of polycrystalline samples up to 300 µm in size was possible, as well as a the realization of a nearly ideal macrocrystal. Using small angle x-ray scattering at our in-house instrument GALAXI the supercrystalline structure and quality of ordering could be characterized. The magnetic properties were investigated by a variety of magnetometric methods. Additional samples of nearly non-interacting NP were prepared to characterize the magnetic behavior of the individual NP. A comparision between the polycrystalline, single crystal and dispersed samples was performed. For a microscopic investigation of the magnetic ordering in the supercrystals, small angle neutron scattering was employed.