Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65
MA 20.46: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU C
X-ray absorption and magnetic circular dichroism studies of ion bombarded ferromagnet-antiferromagnet bilayers — •J. Schmalhorst1, M. Sacher1, V. Höink1, G. Reiss1, D. Engel2, and A. Ehresmann2 — 1University of Bielefeld, Department of Physics, Nano Device Group, P.O. Box 100131, 33501 Bielefeld, Germany — 2Department of Physics, Kaiserslautern University of Technology, D-67663 Kaiserslautern, Germany
The influence of He ion bombardment on the structural and magnetic interface properties of a polycrystalline Mn83Ir17 / Co antiferromagnet-ferromagnet bilayer system is investigated1. For annealed as well as for not annealed samples an exchange bias field of up to 200 Oe is induced by the ion bombardment for doses up to 5× 1014 ions / cm2. The X-ray absorption and the X-ray magnetic circular dichroism of Co and Mn is not significantly altered by this ion dose. For higher doses the exchange bias field is strongly reduced and accompanied by an increase of the ratio of the Mn to Co X-ray absorption intensities and a reduction of the Co X-ray magnetic circular dichroism signal. A model with a gaussian like intermixing zone at the AF / FM interface is developed to account for the observed changes of the X-ray absorption spectra. The authors gratefully acknowledge the opportunity to perform soft X-ray absorption spectroscopy at the Advanced Light Source, Berkeley, USA.
[1] J. Schmalhorst, M. Sacher, V. Höink, G. Reiss, D. Engel, A. Ehresmann, Phys. Rev. B, in press