Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 14: Topical Session Nanoanalytics using Small-Angle Scattering II

MM 14.2: Vortrag

Dienstag, 24. März 2009, 12:15–12:30, IFW A

Small Angle Scattering by Magnetic Nanoparticles — •Sabrina Disch, Raphaël P. Hermann, Peter Busch, Wiebke F. C. Sager, and Thomas Brückel — Institut für Festkörperforschung JCNS and JARA-FIT, Forschungszentrum Jülich GmbH; 52425 Jülich

Intensive research has been dedicated to magnetic nanostructures, both because of their possible applications, e. g. in medical imaging, catalysis, information storage, and owing to the interest in fundamental understanding of their magnetic properties. Magnetic nanoparticles, compared to bulk materials, show unique physical properties such as superparamagnetism or enhanced anisotropy constants. Very little is known about the magnetization distribution within a single particle and magnetic correlations in ordered arrangements of such nanoparticles. Small-angle scattering is the method of choice for investigating both intraparticular phenomena, such as the magnetization distribution or the spin structure of individual magnetic nanoparticles, and interparticular interactions of such nanoparticles in higher dimensional nanostructures. However, before addressing the problems of magnetization distributions or magnetic interactions between magnetic nanoparticles, the availability and the precise structural characterization of highly monodisperse nanoparticles is required. We developed a micellar synthesis route to cobalt nanoparticles with a narrow size distribution and will present latest advances in synthesis optimization and structural characterization along with recent work on highly monodisperse iron oxide nanospheres and nanocubes, including their deposition on substrates and structural characterization by SAXS and GISAXS.