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MA: Fachverband Magnetismus
MA 16: Magnetic Particles and Clusters I
MA 16.7: Talk
Tuesday, February 26, 2008, 12:00–12:15, H 1028
Self-ordering of cobalt nanoparticles on a Si substrate — •Katharina Theis-Bröhl1, Maximilian Wolff1, Boris P. Toperverg1, Inga Ennen2, and Andreas Hütten2 — 1Department of Experimental and Solid State Physics, Ruhr-University Bochum, 44780 Bochum — 2Thin films and nanostructures, Faculty of Physics, Bielefeld University, D-33615 Bielefeld
Magnetic nanoparticles are potential candidates for future data storage as well as vehicles for biomedical, e.g., in therapy and diagnosis, applications. From this point of view nanoparticles with high magnetic moments are under consideration as a new magnetic particle generation and deserve detailed and comprehensive investigation using various physical methods. In this study a combination of polarized neutron reflectometry and grazing incident small angle scattering was employed to deduce the structural and magnetic arrangement of cobalt-oelamin nano-complexes prepared by layer-by-layer dropping on a Si substrate. For this study we used Co nanoparticles with a diameter of 13.2 nm and prepared a relatively thick film of 20 layers. It was found that the magnetization of the Co nanoparticles maintains its saturation value. Inside the film the nanoparticles are self-organized into a 3D para-crystalline-like lattice with the positional order well defined over a few inter-particle spacings.
We acknowledge funding by BMBF (O3ZA6BC1) and by ILL. Furthermore we would like to thank C. Waltenberg and D. Meißner for the synthesis of the nanoparticles.