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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 20.47: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Initialization of unidirectional anisotropy in a ferromagnet - antiferromagnet bilayer by keV-He ion bombardment — •D. Engel¹, A. Ehresmann¹, J. Schmalhorst², M. Sacher², V. Höink², and G. Reiss² — ¹Fachbereich Physik, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany — ²Fakultät für Physik, Universität Bielefeld, D-33501 Bielefeld, Germany

A polycrystalline Cu/Ni₈₀Fe₂₀/Mn₈₃Ir₁₇/Co/AlO_x ferromagnet-antiferromagnet layer system was grown without applying an external magnetic field showing no unidirectional anisotropy in the as prepared state. After 10-keV He-ion bombardment in an external in-plane magnetic field a clear unidirectional anisotropy collinear to the magnetic field direction during bombardment is observed, indicating that ion bombardment can be used for this system to initialize the unidirectional exchange anisotropy. The magnetization reversal processes for various ion doses are discussed, based on longitudinal Magnetooptical Kerr-Effect measurements.