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Multivariate statistical characterization of charged and uncharged domain walls in multiferroic hexagonal YMnO3 single crystal visualized by a spherical aberration-corrected STEM

Journal Article


Abstract


  • A state-of-the-art spherical aberration-corrected STEM was fully utilized to directly visualize the multiferroic domain structure in a hexagonal YMnO3 single crystal at atomic scale. With the aid of multivariate statistical analysis (MSA), we obtained unbiased and quantitative maps of ferroelectric domain structures with atomic resolution. Such a statistical image analysis of the transition region between opposite polarizations has confirmed atomically sharp transitions of ferroelectric polarization both in antiparallel (uncharged) and tail-to-tail 180° (charged) domain boundaries. Through the analysis, a correlated subatomic image shift of Mn–O layers with that of Y layers, exhibiting a double-arc shape of reversed curvatures, have been elucidated. The amount of image shift in Mn–O layers along the c-axis is statistically significant as small as 0.016 nm, roughly one-third of the evident image shift of 0.048 nm in Y layers. Interestingly, a careful analysis has shown that such a subatomic image shift in Mn–O layers vanishes at the tail-to-tail 180° domain boundaries. Furthermore, taking advantage of the annular bright field (ABF) imaging technique combined with MSA, the tilting of MnO5 bipyramids, the very core mechanism of multiferroicity of the material, is evaluated.

UOW Authors


  •   Matsumoto, Takao (external author)
  •   Ishikawa, Ryo (external author)
  •   Tohei, Tetsuya (external author)
  •   Kimura, Hideo (external author)
  •   Yao, Qiwen (external author)
  •   Zhao, Hongyang (external author)
  •   Wang, Xiaolin
  •   Chen, Dapeng (external author)
  •   Cheng, Zhenxiang
  •   Shibata, Naoya (external author)
  •   Ikuhara, Yuichi (external author)

Publication Date


  • 2013

Citation


  • Matsumoto, T., Ishikawa, R., Tohei, T., Kimura, H., Yao, Q., Zhao, H., Wang, X., Chen, D., Cheng, Z., Shibata, N. & Ikuhara, Y. (2013). Multivariate statistical characterization of charged and uncharged domain walls in multiferroic hexagonal YMnO3 single crystal visualized by a spherical aberration-corrected STEM. Nano Letters: a journal dedicated to nanoscience and nanotechnology, 13 (10), 4594-4601.

Scopus Eid


  • 2-s2.0-84885437586

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/930

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 4594

End Page


  • 4601

Volume


  • 13

Issue


  • 10

Place Of Publication


  • United States

Abstract


  • A state-of-the-art spherical aberration-corrected STEM was fully utilized to directly visualize the multiferroic domain structure in a hexagonal YMnO3 single crystal at atomic scale. With the aid of multivariate statistical analysis (MSA), we obtained unbiased and quantitative maps of ferroelectric domain structures with atomic resolution. Such a statistical image analysis of the transition region between opposite polarizations has confirmed atomically sharp transitions of ferroelectric polarization both in antiparallel (uncharged) and tail-to-tail 180° (charged) domain boundaries. Through the analysis, a correlated subatomic image shift of Mn–O layers with that of Y layers, exhibiting a double-arc shape of reversed curvatures, have been elucidated. The amount of image shift in Mn–O layers along the c-axis is statistically significant as small as 0.016 nm, roughly one-third of the evident image shift of 0.048 nm in Y layers. Interestingly, a careful analysis has shown that such a subatomic image shift in Mn–O layers vanishes at the tail-to-tail 180° domain boundaries. Furthermore, taking advantage of the annular bright field (ABF) imaging technique combined with MSA, the tilting of MnO5 bipyramids, the very core mechanism of multiferroicity of the material, is evaluated.

UOW Authors


  •   Matsumoto, Takao (external author)
  •   Ishikawa, Ryo (external author)
  •   Tohei, Tetsuya (external author)
  •   Kimura, Hideo (external author)
  •   Yao, Qiwen (external author)
  •   Zhao, Hongyang (external author)
  •   Wang, Xiaolin
  •   Chen, Dapeng (external author)
  •   Cheng, Zhenxiang
  •   Shibata, Naoya (external author)
  •   Ikuhara, Yuichi (external author)

Publication Date


  • 2013

Citation


  • Matsumoto, T., Ishikawa, R., Tohei, T., Kimura, H., Yao, Q., Zhao, H., Wang, X., Chen, D., Cheng, Z., Shibata, N. & Ikuhara, Y. (2013). Multivariate statistical characterization of charged and uncharged domain walls in multiferroic hexagonal YMnO3 single crystal visualized by a spherical aberration-corrected STEM. Nano Letters: a journal dedicated to nanoscience and nanotechnology, 13 (10), 4594-4601.

Scopus Eid


  • 2-s2.0-84885437586

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/930

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 4594

End Page


  • 4601

Volume


  • 13

Issue


  • 10

Place Of Publication


  • United States