Image formation mechanisms of spherical aberration corrected BF STEM imaging methods

In this study, we explore the formation mechanisms of different spherical-aberration (Cs)-corrected bright-field (BF) scanning transmission electron microscope (STEM) imaging methods. The Cs-corrected BF STEM imaging modes are characterised in detail using simulated images and experimental BF STEM i...

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Bibliographic Details
Published in:Ultramicroscopy 2014-01, Vol.136, p.119-126
Main Authors: Kotaka, Yasutoshi, Yamazaki, Takashi, Ohtsuka, Masahiro, Watanabe, Kazuto
Format: Article
Language:English
Subjects:
BF STEM
Cs-corrector
Double detector STEM
MABF STEM
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Summary:In this study, we explore the formation mechanisms of different spherical-aberration (Cs)-corrected bright-field (BF) scanning transmission electron microscope (STEM) imaging methods. The Cs-corrected BF STEM imaging modes are characterised in detail using simulated images and experimental BF STEM images obtained with several types of detectors. The Co3O4 specimen results show that the occupancy, the atomic spacing, and the atomic number of the atoms constituting the atomic columns control image formation in BF STEM imaging, which is used to detect light atomic columns. The middle-angle BF STEM image is crucial in image formation by BF STEM imaging. •We explore the formation mechanisms of diversified Cs-corrected STEM imaging methods.•SrTiO3 and Co3O4 were observed by several BF STEM imaging methods.•MABF STEM plays a key role in image formation for visualising a light atomic column.•Occupancy, spacing and the atomic number in atomic columns control the image formation.
ISSN:0304-3991
1879-2723
DOI:10.1016/j.ultramic.2013.09.005