Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 644, Issue -, Pages 570-574Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.04.205
Keywords
Transmission electron microscopy (TEM); Scanning/transmission electron microscopy (STEM); High-angle annular darkfield (HAADF); Z-contrast microscopy; Antiphase domains
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Funding
- Research Foundation Flanders (FWO, Belgium) [G.0368.15 N, G.0369.15 N, G.0374.13 N]
- European Research Council under an ERC starting Grant [278510]
- Japan Society for the Promotion of Science (JSPS, Japan) [R2408]
- Hercules fund from the Flemish Government
- European Research Council (ERC) [278510] Funding Source: European Research Council (ERC)
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Anti-phase boundaries (APBs) in an ordered CoPt alloy are planar defects which disturb the ordered structure in their vicinity and decrease the magnetic properties. However, it has not yet been clarified to what extend the APBs disturb the ordering. In this study, high-resolution HAADF-STEM images are statistically analysed based on the image intensities estimated by the statistical parameter estimation theory. In the procedure, averaging intensities, fitting the intensity profiles to specific functions, and assessment based on a statistical test are performed. As a result, the APBs in the stable CoPt are found to be characterised by two atomic planes, and a contrast transition range as well as the centre of an inclined APB is determined. These results show that the APBs are quite sharp and therefore may have no notable effect on the net magnetic properties due to their small volume fraction. (C) 2015 Elsevier B.V. All rights reserved.
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