SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 3: Posters Magnetism I

MA 3.5: Poster

Monday, September 27, 2021, 13:30–16:30, P

Interlinking ferro- and antiferromagnetic thickness dependencies of macroscopic magnetic characteristics with microscopic properties of polycrystalline exchange-biased bilayers — •Maximilian Merkel, Meike Reginka, Rico Huhnstock, and Arno Ehresmann — Universität Kassel

A systematic investigation of the exchange bias shift and the coercive field exhibited by prototypical polycrystalline exchange-biased bilayers is conducted in dependence of the thicknesses of the participating ferro- and antiferromagnetic layer. Columnar grain growth is verified via thickness dependent grain size analysis by means of atomic force microscopy. Formulating analytic expressions for the named thickness dependencies allowed us to establish a quantitative link between the macroscopically observable magnetic characteristics and the microscopic properties. Relations depending on measurement conditions and parameters describing the microstructure of the granular antiferromagnetic layer in the context of a generalized description of polycrystalline exchange-bias systems were hereby thoroughly considered. This is facilitated by an extended time-dependent Stoner-Wohlfarth approach in combination with angular-resolved measurements of magnetization reversal curves utilizing magneto-optical Kerr magnetometry validating the consistency of the generalized model approach.