Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Magnetic Coupling Phenomena/ Exchange Bias
MA 33.4: Vortrag
Mittwoch, 28. März 2012, 16:00–16:15, EB 202
Ripple formation in ion bombarded exchange bias systems — •Alexander Gaul1, Dieter Engel1, Hans Peter Oepen2, Sebastian Hankemeier2, and Arno Ehresmann1 — 1Department of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel — 2Institute of Applied Physics and Microstructure Advanced Research Center, University of Hamburg, Jungiusstr. 11, D-20355 Hamburg
Artificial magnetic domain patterns with three different magnetization directions in the same layer system have been fabricated by keV-He ion bombardment induced magnetic patterning in IrMn/NiFe exchange biased layers.
High resolution magnetic imaging via scanning electron microscope with polarization analysis (SEMPA) revealed magnetic ripple domains as a fine structure in the artificially fabricated domains. It is shown that the long axes of the ripple domains are always perpendicular to the exchange bias field direction of the respective domain. The magnetic ripple period length has been obtained by fast Fourier transform (FFT) of the SEMPA data. The ripple period length increases with decreasing magnetic anisotropy, which has been varied by applying different fluencies of the ions during bombardment.