Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.35: Poster
Tuesday, March 17, 2015, 09:30–13:00, Poster A
Control of the Magnetic Structure of Co/Pd Thin Films by Direct Laser Interference Patterning — •Philipp Graus1, Martin Stärk1, Frank Schlickeiser1, Elke Scheer1, Manfred Albrecht2, Paul Leiderer1, Ulrich Nowak1, Mikhail Fonin1, and Johannes Boneberg1 — 1Uni Konstanz — 2Uni Augsburg
Pulsed two-beam laser interference is used to generate two-dimensional temperature patterns on a magnetic sample. We show that the original domain structure of a Co/Pd multilayer thin film can be switched into a small grain size state upon exceeding the Curie temperature by thermal demagnetization. This finding is supported by numeric simulations using the Landau-Lifshitz-Bloch formalism. The small domains can be switched back into the original domain sizes by demagnetization. At even higher temperatures the multilayer system is irreversibly changed. In this area no out-of-plane magnetization can be found after a subsequent demagnetization. Thus, a two-dimensional temperature pattern can be transferred into a magnetic stripe pattern. In this way one can achieve magnetic nanowire arrays with lateral dimensions in the order of 100 nm. Typical patterned areas are in the range of several millimeters. Hence, the parallel Direct Laser Interference Patterning (DLIP) method of magnetic thin films is an attractive alternative to the conventional serial electron beam writing of magnetic nanostructures.