Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 12: Magnetic Particles/ Clusters II
MA 12.1: Talk
Monday, March 14, 2011, 17:00–17:15, HSZ 103
Structural and magnetic characterization of self assembled iron oxide nanoparticles — •Durgamadhab Mishra1, Maria Jose Benitez1, Philipp Szary1, Giovanni A Badini Confalonieri1, Mathias Feyen2, Anhui Lu2, Leonardo Agudo3, Günther Eggeler3, Oleg Petracic1, and Hartmut Zabel1 — 1Festkörperphysik, Ruhr Universität Bochum D -44780 Bochum — 2Max-Planck-Institut für Kholenforschung, D-45470 Mülheim an der Ruhr — 3Institute of Materials, Department of Materials Science D-44780 Bochum
Magnetic nanoparticles (NPs) are at the forefront of research due to their potential in applications as e.g. in biomedicine, spintronics and high density data storage. Particularly iron oxide NPs have widely been investigated for their biocompatibility and half metallic properties. In order to achieve a complete control over the various functionalities one has to obtain well defined phases of iron oxide. We synthesized 20 nm NPs following the synthesis method as described in Park et al (2004). The NPs were self-assembled after spin-coating on Si substrates in monolayers or multilayers of NPs. Various annealing conditions lead to different iron oxide phases. We characterized the monolayers by grazing incidence diffraction (GID), SQUID magnetometry and dark field TEM analysis. We show that in all cases a multi-phase structure is obtained with finite exchange bias between a ferrimagnetic and an antiferromagnetic phase [1].
[1] M.J. Benitez et al., submitted (arXiv:1010.0938)