Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MA: Magnetismus
MA 19: Mikro- und nanostrukturierte magn. Materialien I
MA 19.8: Vortrag
Montag, 7. März 2005, 12:15–12:30, TU EMH225
DOMAIN PROPAGATION IN ION BOMBARDED MAGNETIC WIRES WITH OPPOSITE EXCHANGE BIAS — •K. Theis-Bröhl1, B. P. Toperverg1, J. McCord2, U. Rücker3, J. Schmalhorst4, V. Höink4, H. Brückl4, T. Weis5, D. Engel5, A. Ehresmann5, and H. Zabel1 — 1Department of Experimental and Solid State Physics, Ruhr-University Bochum, 44780 Bochum — 2Material Research Institute, Helmholtzstr. 20, 01169 Dresden — 3Institute of Solid State Research, Forschungszentrum Jülich, 52425 Jülich — 4Department of Physics, University Bielefeld, Universitätsstr. 25, 33615 Bielefeld — 5Faculty of Physics, Kaiserslautern University of Technology, 67663 Kaiserslautern
Exchange biased CoFe/MnIr films are magnetically patterned with He-ion bombardment into two magnetic regions (stripes) with oppositely aligned exchange bias. The longitudinal magnetization reversal occurs through head-on domain wall motion and partial penetration of magnetization from neighboring stripes. It is highly asymmetric and involves ripple-like domain structures and incoherent rotation of magnetization. This was measured using Kerr microscopy and polarized neutron reflectivity methods. For the quantitative analysis of our data we applied a theoretical model using the Distorted Born Wave Approximation which provides us with a set of parameters quantifying the magnetization arrangement in the magnetic pattern. This all together gives access to a detailed understanding of the magnetization arrangement and the magnetization reversal. We acknowledge funding by DFG, SFB 491 and BMBF 032AE8BO.