Sub-Ångstrom electric field measurements on a universal detector in a scanning transmission electron microscope

Advanced Structural and Chemical Imaging
Jordan A HachtelMiaofang Chi

Abstract

Scanning transmission electron microscopy (STEM) excels in accessing atomic-scale structure and chemistry. Enhancing our ability to directly image the functionalities of local features in materials has become one of the most important topics in the future development of STEM. Recently, differential phase contrast (DPC) imaging has been utilized to map the internal electric and magnetic fields in materials from nanoscale features such as p-n junctions, skyrmions, and even from individual atoms. Here, we use an ultra-low noise SCMOS detector in as the diffraction plane camera to collect four-dimensional (4D) datasets. The high angular resolution, efficient high-SNR acquisition, and modifiability of the camera allow it to function as a universal detector, where STEM imaging configurations, such as DPC, bright field, annular bright field, and annular dark field can all be reconstructed from a single 4D dataset. By examining a distorted perovskite, DyScO3, which possesses projected lattice spacings as small as 0.83 Å, we demonstrate DPC spatial resolution almost reaching the information limit of a 100 keV electron beam. In addition, the perovskite has ordered O-coordinations with alternating octahedral tilts, which can be quantitati...Continue Reading

References

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Citations

May 14, 2019·Angewandte Chemie·Michael J ZachmanMiaofang Chi
Mar 5, 2020·Nanoscale·Melonie P ThomasBeth S Guiton
Jul 7, 2020·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Magnus NordGary W Paterson
May 16, 2019·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Colin Ophus
Jul 15, 2020·Nanotechnology·Ankit Nalin MehtaWilfried Vandervorst
Oct 24, 2020·Proceedings of the National Academy of Sciences of the United States of America·Matus Krajnak, Joanne Etheridge
Mar 29, 2021·Ultramicroscopy·Jacob MadsenToma Susi
May 22, 2021·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Benjamin H SavitzkyColin Ophus
Jul 28, 2021·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Scott D FindlayLeslie J Allen

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Methods Mentioned

BETA
scanning
transmission electron microscopy
X-ray
electron ptychography
PCA

Software Mentioned

SciPy
learn Python
sci
kit

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