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MA: Fachverband Magnetismus
MA 27: Magnetic Thin Films II of 2
MA 27.8: Vortrag
Mittwoch, 13. März 2013, 17:00–17:15, H3
Symmetric magnetization reversal in polycrystalline exchange coupled systems — •Amitesh Paul1, Neelima Paul2, Arno Ehresmann3, Stefan Mattauch4, and Peter Böni1 — 1Technische Universität München, Physik Department E21,James-Franck-Strasse, D-85748 Garching b. München Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH,Hahn-Meitner-Platz 1, D-14109 Berlin, Germany — 3Universität Kassel, Institut für Physik and CINSaT, Heinrich-Plett-Strasse 40, D-34132 Kassel, Germany — 4Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at FRM II, Lichtenbergstraße 1, 85747, Garching, Germany
Training in exchange bias systems plays an essential role in understanding the very origin of the biasing effect. The nonequilibrium arrangement of antiferromagnetic (AF) spins at the antiferromagnetic-ferromagnetic interface, related to the AF uniaxial anisotropy, plays a crucial role during the initial training. Our system of choice,IrMn/CoFe, possesses softer uniaxial anisotropy compared to other AF systems (e.g., CoO), thereby reducing the energy penalty due to nonequilibrium spins. Different methods have been applied to initialize or modify the unidirectional anisotropy. Magnetization reversal mechanisms were investigated during the first two field cycles to identify the role of each method on the training. A detailed analysis of polarized neutron scattering using the distorted wave Born approximation reveals a simultaneous process of domain nucleation and coherent rotation for magnetization reversal.