Dresden 2014 – scientific programme
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MA: Fachverband Magnetismus
MA 23: Micro- and Nanostructured Magnetic Materials
MA 23.7: Talk
Wednesday, April 2, 2014, 11:15–11:30, HSZ 403
Magnetisation Reversal of In-Plane and Out-of-Plane Magnetised Antidot Lattices — •Joachim Gräfe1, Felix Häring2, Ulf Wiedwald4, Paul Ziemann2, Kristof Lebecki3, Ulrich Nowak3, Gisela Schütz1, and Eberhard Goering1 — 1Max Planck Institute for Intelligent Systems, Stuttgart, Germany — 2Department of Solid State Physics, Ulm, Germany — 3Department of Physics, Konstanz, Germany — 4Faculty of Physics, Duisburg, Germany
Antidot lattices allow tailoring of important magnetic properties like coercivity and magnetic anisotropy. Angular and spatially resolved MOKE measurements as well as magnetic x-ray microscopy (MAXYMUS) were conducted in order to gain insight into magnetisation properties of in-plane (Fe) and out-of-plane (GdFe) antidot systems. These studies were complemented by first order reversal curve (FORC) measurements and micromagnetic simulations. The magnetisation behaviour of in-plane antidot lattices is dominated by domain wall pining in the narrow bridges between the holes. Domain walls run along the antidot rows and sudden domain wall motion occurs for a critical field applied along the nearest neighbour direction. For the next nearest neighbour direction the magnetisation reversal follows a rotational mechanism via an intermediate easy axis. Out-of-plane systems do not suffer from additional stray field losses at the antidots as in-plane systems do. Nevertheless, we found a significant influence on the coercivity and the shape of the hysteresis loops of thin films with perpendicular magnetic anisotropy and antidot structuring. FORC measurements reveal an interplay between exchange and dipole interactions.