Regensburg 2004 – scientific programme

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MA: Magnetismus

MA 10: Exchange Bias

MA 10.5: Talk

Tuesday, March 9, 2004, 11:15–11:30, H10

Investigation of the Fe₁₉Ni₈₁/Fe₅₀Mn₅₀ exchange bias system with varying Cu spacer layer for partial decoupling — •Oskar Liedke, Hans Nembach, Jürgen Fassbender, and Burkard Hillebrands — Fachbereich Physik und Forschungsschwerpunkt MINAS, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern

In order to modify the exchange interaction in a Fe₁₉Ni₈₁/Fe₅₀Mn₅₀ exchange bias system a Cu interlayer of varying thickness and position with respect to the interface has been introduced. In one direction the position of the intervening Cu layer varies from the interface to the top surface of the Fe₅₀Mn₅₀ layer at a constant Cu thickness, and in the other direction the Cu thickness itself varies. The introduction of the Cu layer leads to a partial exchange decoupling. The samples were grown in a UHV MBE system and investigated by magneto-optic Kerr effect magnetometry. Two-dimensional maps are obtained, which provide global information about the influence of the partial decoupling of the antiferromagnet as a function of Cu thickness t_Cu and FeMn thickness t_FeMn. In order to obtain more quantitative information several line scans along the horizontal and vertical axes were evaluated. The influence of the partial decoupling on the origins of exchange bias will be discussed.