Berlin 2005 – scientific programme

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MA: Magnetismus

MA 15: Magnetische Kopplungsph
änomene / Exchange Bias

MA 15.2: Talk

Saturday, March 5, 2005, 14:15–14:30, TU H1028

Detailed agreement between simulated hysteresis loops and experimental vector-MOKE data of CoFe/IrMn exchange bias bilayer — •Florin Radu, Andreas Westphalen, Katharina Theis-Bröhl, Kurt Westerholt, and Hartmut Zabel — Experimentalphysik/Festkörperphysik, Ruhr-Univeristät Bochum, 44780 Bochum,Germany

We show simulations based on the Meiklejohn and Bean approach and compare them with longitudinal and transversal hysteresis loops (vector MOKE) of CoFe/IrMn exchange biased bilayer. In the model we split the interfacial exchange energy in two parts: one term is the unidirectional contribution which is responsible for the exchange bias shift; the other term is an effective uniaxial anisotropy which contributes to the increased coercive field of the exchange bias effect observed in all F/AF systems. This is a key assumption of the model which we attributed to a spin-glass behavior of the interface. The hypothesis involved in the approach is suggested by recent experiments performed by neutron and soft-xray magnetic scattering which highlights the different nature of the interface in relation to the ferromagnetic and antiferromagnetic layer. The simulations we have performed are in excellent agreement with the experimental data.

This work was supported by SFB 491.