Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 26: Exchange Bias
MA 26.12: Vortrag
Donnerstag, 29. März 2007, 18:00–18:15, H10
Magnetic order in exchange bias patterns in a continuous film — •Katharina Theis-Bröhl1, Boris Toperverg1, Ulrich Rücker2, Jeffrey McCord3, Andreas Westphalen1, Volker Höink4, Jan Schmalhorst4, Tanja Weis5, Dieter Engel5, Arno Ehresmann5, Maximilian Wolff1, and Hartmut Zabel1 — 1Ruhr-University, 44780 Bochum — 2Forschungszentrum, 52425 Jülich — 3Leibniz Institute for Solid State and Materials Research, 01169 Dresden — 4University of Bielefeld, 33615 Bielefeld — 5University of Kassel, 34132 Kassel
Understanding and controlling competing exchange bias (EB) and exchange coupling effects is an important issue in the design of advanced AF-coupled hard disks with increasing storage density. For this purpose we used magnetic patterning by ion bombardment and designed a model system of alternating EB stripes. This creates an alternating frozen-in interfacial EB field competing with the external field in the course of re-magnetization. It was found that at magnetic fields applied along and at an angle with respect to the EB axis parallel to stripes the re-magnetization processes goes through a variety of different stages. Each of those magnetic states is quantitatively characterized via the comprehensive analysis of data on specular and off-specular polarized neutron reflectivity. The results are interpreted within the phenomenological model containing a few parameters which can readily be controlled designing systems with desired configuration of magnetic moments of micro- and nano-elements.
We acknowledge funding by DFG, SFB 491 and BMBF O3ZA6BC1.