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Angular resolved measurements of the exchange bias field and the coercivefield are a powerful tool to distinguish between different competing magneticanisotropies in polycrystalline exchange bias layer systems. No simpleanalytical model is as yet available, which considers time dependent effectslike enhanced coercivity arising from the grain size distribution of theantiferromagnet. In this work we expand an existing model class describingpolycrystalline exchange bias systems by a rotatable magnetic anisotropy termto describe grain size correlated effects. Additionally, we performed angularresolved magnetization curve measurements using vectorial magnetooptic Kerrmagnetometry. Comparison of the experimental data with the proposed model showsexcellent agreement and reveals the ferromagnetic anisotropy and propertiesconnected to the grain size distribution of the antiferromagnet. Therefore, adistinction between the different influences on coercivity and anisotropybecomes available.

Grain size correlated rotatable magnetic anisotropy in polycrystalline exchange bias systems