Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.20: Poster
Freitag, 26. März 2010, 11:00–14:00, Poster B1
Antiferromagnetically coupled Fe/Cr/Fe micropatterns in a ferromagnetically coupled environment — •Roland Neb1, Peter Andreas Beck1, Thomas Sebastian1, Philipp Pirro1, Burkard Hillebrands1, Stefan Pofahl2, Rudolf Schäfer2, Bernhard Reuscher3, and Michael Kopnarski3 — 1FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 2IFW Dresden, 01069 Dresden, Germany — 3IFOS, 67663 Kaiserslautern, Germany
The exchange-coupled Fe/Cr/Fe-trilayer system is known to exhibit different kinds of coupling, depending on the thickness of the interlayer. We examine antiferromagnetically coupled trilayers which are magnetically patterned by focused ion beam irradiation with 30 keV Ga-ions. The irradiated regions become ferromagnetic, which allows us to create well defined areas with very low topographic inhomogenities where the two Fe layers couple ferromagnetically. We study antiferromagnetically coupled elements in a ferromagnetic environment using Kerr microscopy and MFM, showing that the coupling turns ferromagnetic when the elements are smaller than a few microns. The influence of the environment on the elements is analyzed by using different sizes and shapes of elements and environment, showing that the magnetic behavior of such elements is mainly driven by the surrounding ferromagnetic area.
Support from the Deutsche Forschungsgemeinschaft and Graduiertenkolleg 792 is gratefully acknowledged.