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MA: Fachverband Magnetismus

MA 65: Poster 2

MA 65.6: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG1

Monte-Carlo simulation studies on the superspin structure of 3D nanoparticle supercrystals — •Mauricio Cattaneo, Michael Smik, Oleg Petracic, and Thomas Brückel — Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich

The assembly of magnetic nanoparticles into large 3D structures constitutes a novel way of fabricating artificial materials that show properties that are not found in conventional systems. A detailed understanding of the magnetic properties is impeded by the huge number of contributing parameters as well as the difficulty in probing the internal magnetic structure in situ. Monte-Carlo simulations offer the possibility to predict numerically possible magnetic ground states. Sufficiently small nanoparticles can be considered as single domain which may be modelled as an effective superspin. In contrast to atomic spins, the dominating inter-particle interaction is the dipole-dipole interaction. We simulated regularly arranged supercrystals of iron oxide nanoparticles with diameters between 10-20nm with various supercrystal structures and with various easy-axis orientations. Using the Metropolis scheme, we simulated the temperature dependent magnetization and ac susceptibility at various applied magnetic fields. The results are compared to measurements of experimental nanoparticle supercrystals.