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MA: Fachverband Magnetismus
MA 12: Magnetic Particles/ Clusters II
MA 12.4: Vortrag
Montag, 14. März 2011, 17:45–18:00, HSZ 103
Fabrication of ferromagnetic Co/Pt nanodots on NaCl-crystals — •Mahmut Caylioglu1, Andreas Rathjen1, Alexander Neumann1, André Kobs1, Andreas Meyer2, Robert Frömter1 und Hans Peter Oepen1 — 1Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany — 2Institut für Physikalische Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
Recently, we have successfully studied the growth of ferromagnetic Co/Pt multilayers with perpendicular anisotropy on various substrates. Utilizing SiO2 cores of micelles as shadow mask [1] we could create ferromagnetic nanodots in the range < 20 nm [2]. For the purpose of producing nanodots in solution we have investigated the growth and nanodot fabrication on NaCl. In this talk we report on the preparation of cleaved NaCl surfaces that is necessary to get a layer-by-layer growth of the multilayer and a monomicellar coverage via spin coating of the micelles. In contradiction to the results obtained with Si and SiO2, multilayers of composition (Co0,8 nm/Pt2 nm)4 have an in-plane easy plane behavior. This indicates that the interface roughness is increased resulting in a reduced interface anisotropy. In the light of our proposed study we have also produced thicker single Co films sandwiched between Pt. Nanodots made of such films are ferromagnetic and could be dissolved in water and imaged via scanning electron microscopy.
A. Frömsdorf (A.Meyer) et. al., Small 3, 880 (2007),
H.Stillrich et. al. Adv. Funct. Mat 18, 76 (2008)