Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 26: Thin Films: Magnetic Coupling Phenomena / Exchange Bias

MA 26.1: Talk

Tuesday, March 21, 2017, 14:00–14:15, HSZ 101

Analysis of magnetic anisotropies in polycrystalline exchange bias multilayer systems in dependence on field cooling temperature and thickness of buffer layer — Laura Weidenfeller, Nicolas David Müglich, Arno Ehresmann, and •Dennis Holzinger — Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Straße 40, D-34125 Kassel

The influence of the thickness of the buffer layer and the induced anisotropy by the external magnetic field due to different cooling temperatures on the exchange bias is shown. Different thicknesses of the buffer layer combined with field coolings at specific temperatures are measured with angular resolved MOKE.

Using a modified Stoner-Wolfarth model, the measurement results allow conclusions about the grain size distribution in the antiferromagnet which indicates the necessity of a superposition of lognormal functions for the distribution. Further, all used systems show nearly the same exchange bias field, however, induced at different field cooling temperatures. Inspite of no changes in the exchange bias field at a specific temperature, the coercivity instead shows differences.