Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 23: Micro- and Nanostructured Magnetic Materials III

MA 23.1: Talk

Thursday, March 25, 2010, 10:15–10:30, H3

Magnetic properties of closely packed NiFe nanodots — •Norbert Martin¹, Jeffrey McCord¹, Ingolf Mönch¹, Rudolf Schäfer¹, Roland Mattheis², Oliver G. Schmidt¹, and Ludwig Schultz¹ — ¹Leibniz Institut für Festkörper- und Werkstoffforschung IFW Dresden, Postfach 270116 — ²Institut für Photonische Technologien IPHT Jena, Postfach 100239

Permalloy nanodots have been fabricated by means of nanosphere lithography, where a monolayer of nanospheres self assembles to a hexagonal array on top of the ferromagnetic film. To etch closely packed structures of NiFe dots with a small tilt at the dot's edge more robust Silica nanospheres in comparison to Polystyrene nanospheres are used. Therefore it is possible to decrease the dipolar interaction and favor vortex nucleation, which is necessary to achieve highly dense magnetic vortex structures. Magneto-optic hysteresis measurements and micromagnetic simulations of hexagonal dot arrays with tilted edges confirm that vortex nucleation takes place, which is mainly attributed to the shape of the dots.