Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Magnetic Particles / Clusters
MA 35.3: Vortrag
Mittwoch, 22. März 2017, 10:00–10:15, HSZ 101
Structural and magnetic properties of self-assembled iron oxide nanoparticle films — •Xiao Sun1, Michael Smik1, Emmanuel Kentzinger1, Aladin Ullrich2, Ulrich Rücker1, Oleg Petracic1, and Thomas Brückel1 — 1Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich — 2Lehrstuhl für Experimentalphysik II, Universität Augsburg, Augsburg
2D self-assembled iron oxide nanoparticles (NPs) with various sizes (11-20nm) have been studied using magnetometry and Grazing Incidence Small Angle X-ray Scattering (GISAXS). Self-assembled NP films have been fabricated using various methods (e.g. drop-casting/liquid-air-interface) and characterized by scanning electron microscopy and GISAXS. The GISAXS patterns are compared with the simulation results from the software BornAgain[1]. Magnetometry results show an exchange bias effect in hysteresis loops. By comparing hysteresis loops cooled at different magnetic fields, a hardening effect can be observed, i.e. the squareness and hardness of hysteresis loops is significantly enhanced with increasing magnetic cooling field. Due to the antiferromagnetic wustite component, the spins of the ferromagnetic magnetite/maghemite components are exchange biased and an anisotropy axis is induced. The influence of the induced anisotropy onto the magnetic correlations of the magnetic superspins was investigated. The hardening effect of diluted iron oxide NPs is compared to self-assembled NP films. [1]http://bornagainproject.org/