Determination of the atomic width of an APB in ordered CoPt using quantified HAADF-STEM

Hiroshi Akamine, K. H.W. Van Den Bos, N. Gauquelin, S. Farjami, S. Van Aert, D. Schryvers, Minoru Nishida

Research output: Contribution to journalLetter

10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)570-574
Number of pages5
JournalJournal of Alloys and Compounds
Volume644
DOIs
Publication statusPublished - May 26 2015

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Phase boundaries
Magnetic properties
Statistical tests
Parameter estimation
Volume fraction
Defects

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Determination of the atomic width of an APB in ordered CoPt using quantified HAADF-STEM. / Akamine, Hiroshi; Van Den Bos, K. H.W.; Gauquelin, N.; Farjami, S.; Van Aert, S.; Schryvers, D.; Nishida, Minoru.

In: Journal of Alloys and Compounds, Vol. 644, 26.05.2015, p. 570-574.

Research output: Contribution to journalLetter

Akamine, Hiroshi ; Van Den Bos, K. H.W. ; Gauquelin, N. ; Farjami, S. ; Van Aert, S. ; Schryvers, D. ; Nishida, Minoru. / Determination of the atomic width of an APB in ordered CoPt using quantified HAADF-STEM. In: Journal of Alloys and Compounds. 2015 ; Vol. 644. pp. 570-574.
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AU - Akamine, Hiroshi

AU - Van Den Bos, K. H.W.

AU - Gauquelin, N.

AU - Farjami, S.

AU - Van Aert, S.

AU - Schryvers, D.

AU - Nishida, Minoru

PY - 2015/5/26

Y1 - 2015/5/26

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AB - 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.

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