Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 22: Magnetic Particles / Clusters II

MA 22.4: Talk

Wednesday, February 27, 2008, 14:45–15:00, H 1028

Synthesis and Characterization of Magnetic Nanoparticles — •Sabrina Disch, Wiebke Sager, Raphaël Hermann, Günter Goerigk, and Thomas Brückel — Institut für Festkörperforschung, Forschungszentrum Jülich GmbH; 52425 Jülich

Magnetic nanoparticles are the object of intensive research both because of their possible applications e.g. in information storage, catalysis, medical imaging and owing to the interest in fundamental understanding of their magnetic properties. Magnetic nanoparticles, as 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. In order to investigate such phenomena using scattering techniques, samples of highly monodisperse nanoparticles are required.

We developed a synthesis route for the preparation of cobalt nanoparticles with diameters below 10 nm, originally based on the reduction of Co(AOT)₂ in water-in-oil microemulsions [1]. Our water-free synthesis route yields nanoparticle dispersions that are stable against oxidation for weeks if stored in nitrogen atmosphere. Here, we report on the progress made in synthesis optimization as well as magnetic characterization of the as-synthesized particles. We will also present results from scattering experiments performed on cobalt nanoparticles and on highly monodisperse iron oxide nanoparticles [2].

[1] C.Petit, A.Taleb, M.Pileni; J. Phys. Chem. B, 1999, 103, 1805.

[2] J. Park, T. Hyeon; Nat. Mat., 2004, 3, 891.