Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster I

MA 19.10: Poster

Dienstag, 1. April 2014, 13:00–15:30, P1

Magnetic Properties of Self-Assembled Fe₂O₃ Nanoparticles — •Alice Klapper¹, Sabrina Disch², Erik Wetterskog³, Michael Agthe³, Lennart Bergström³, Stefan Mattauch⁴, Oleg Petracic¹, and Thomas Brückel¹ — ¹Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, GERMANY — ²Institut Laue-Langevin, F-38042 Grenoble Cedex 9, FRANCE — ³Materials and Environmental Chemistry, Stockholm University, 10691 Stockholm, SWEDEN — ⁴Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ, Lichtenbergstr. 1, 85748 Garching, GERMANY

Today’s requirements for data storage density grow continuously. Magnetic nanoparticles constitute a possible new recording material. Therefore, nanoparticle superlattices have moved into the focus of worldwide research activities. We follow an approach to investigate the magnetic ordering within mesocrystals of cubic shaped γ-Fe₂O₃ nanoparticles (NPs). The crystal structure of the superlattice has been obtained from GISAXS measurements. To have direct access to the magnetic inter-particle superspin-structure inside the supercrystals the usage of the GISANS technique with polarized neutrons is inevitable. We performed polarized GISANS measurements in various applied fields and obtained results, which are correlated to models of collective magnetic states inside mesocrystals.