Journal Highlights


Techniques


HAADF-STEM Image Resolution Enhancement Using High-Quality Image Reconstruction Techniques: Case of Fe3


O4 (111) Surface by G Bárcena-González, MP Guerrero-Lebrero, E Guerrero, A Yañez, B Nuñez-Moraleda,


D Kepaptsoglou, VK Lazarov, and PL Galindo, Microsc Microanal | doi: 10.1017/S1431927619014788 Microscopes can now provide multiple images of


the same sample region in a very short period of time, and methods that rely on the use of a series of images are being developed. Rather than using a single image to extract information, the underlying idea is to take advantage of the entire series of images to allow details to be localized more precisely using super-resolution (SR) techniques. SR was applied to a series of HAADF-STEM images of Fe3


O4 (111) to improve the signal-to-noise ratio


(SNR) by a factor of 5 and roundness metrics (variability in the shape of the atomic columns) resulting in images with less noise and more detail than the original images. Zooming the SR image of Fe3


O4 (111) in the surface


region (Figure) reveals that the magnetite (111) surface consists of a full monolayer of Fe with the topmost Fe atoms in tetrahedral position (FeA2


). Images before (a) and after (b) SR processing. FeA1 and FeB denote Fe atomic


columns in tetrahedral and octahedral positions. (c) and (d) show intensity pro- files of the boxed areas in (a) and (b). In (c), two intensity peaks are observed, while in the SR image (d) three atomic columns are identified.


2020 March • www.microscopy-today.com


59


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76