Atomap: a new software tool for the automated analysis of atomic resolution images using two-dimensional Gaussian fitting

Magnus Nord1,2, Per Erik Vullum1,3, Ian MacLaren2, Thomas Tybell4, Randi Holmestad1
1Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway
2SUPA-School of Physics and Astronomy, University of Glasgow, Glasgow, UK
3Materials and Chemistry, SINTEF, Trondheim, Norway
4Department of Electronics and Telecommunications, Norwegian University of Science and Technology, Trondheim, Norway

Tóm tắt

AbstractScanning transmission electron microscopy (STEM) data with atomic resolution can contain a large amount of information about the structure of a crystalline material. Often, this information is hard to extract, due to the large number of atomic columns and large differences in intensity from sublattices consisting of different elements. In this work, we present a free and open source software tool for analysing both the position and shapes of atomic columns in STEM-images, using 2-D elliptical Gaussian distributions. The software is tested on variants of the perovskite oxide structure. By first fitting the most intense atomic columns and then subtracting them, information on all the projected sublattices can be obtained. From this, we can extract changes in the lattice parameters and shape of A-cation columns from annular dark field images of perovskite oxide heterostructures. Using annular bright field images, shifts in oxygen column positions are also quantified in the same heterostructure. The precision of determining the position of atomic columns is compared between STEM data acquired using standard acquisition, and STEM-images obtained as an image stack averaged after using non-rigid registration.

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