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A study of intermixing in perovskite superlattices by simulation‐supported cs‐corrected HAADF‐STEM

In this paper, we present and interpret high‐angle annular dark field scanning transmission electron microscopy (HAADF‐STEM) images of La0.7Sr0.3MnO3/SrRuO3 superlattices. The images were taken in a probe‐corrected (cs = 0) FEI microscope at 300 kV. We developed a simulation‐based technique to evaluate possible intermixing at the interfaces via Z‐contrast. The experimental and simulated image intensities across the interfaces are directly compared, where the gradients in the models are systematically varied. Different gradients in different sub‐lattices at the interfaces can clearly be distinguished by a best fit criterion.