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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.7: Poster

Tuesday, March 8, 2016, 09:30–12:30, Poster B1

magnetic hardening effect in self-assembled iron oxide nanoparticle films — •Xiao Sun, Oleg Petracic, and Thomas Brückel — Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52428 Jülich

By comparing the hysteresis loops of iron oxide nanoparticles (NPs) cooled at different magnetic fields, a hardening effect can be observed. The squareness and hardness of hysteresis loops is significantly enhanced with increasing the magnetic cooling field. Due to the antiferromagnetic (AF) wustite component, the spins of the ferrimagnetic 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. Self-assembled NP films have been fabricated using various methods (drop-casting, spin-coating, and liquid-air-interface) using 15 or 20nm iron oxide NPs. Large areas of self-assembled NPs has been achieved using the liquid-air interface method. The hardening effect of diluted iron oxide NPs is compared to self-assembled NP films.