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78 results

Page 1 of 4

  • 3D polarization texture of a symmetric 4-fold flux closure domain in strained ferroelectric PbTiO3 films

  • Y.L. Tang, Y.L. Zhu, Z.J. Hong, E.A. Eliseev, A.N. Morozovska, Y.J. Wang, Y. Liu, Y.B. Xu, B. Wu, L.Q. Chen, S.J. Pennycook, X.L. Ma
  • Journal:
    Journal of Materials Research / Volume 32 / Issue 5 / 14 March 2017
    Published online by Cambridge University Press:
    12 July 2016, pp. 957-967
    Print publication:
    14 March 2017

  • Although the strong coupling of polarization to spontaneous strain in ferroelectrics would impart a flux-closure with severe disclination strains, recent studies have successfully stabilized such a domain via a nano-scaled multi-layer growth. Nonetheless, the detailed distributions of polarizations in three-dimensions (3D) and how the strains inside a flux closure affect the structures of domain walls are still less understood. Here we report a 3D polarization texture of a 4-fold flux closure domain identified in tensile strained ferroelectric PbTiO3/SrTiO3 multilayer films. Ferroelectric displacement analysis based on aberration-corrected scanning transmission electron microscopic imaging reveals highly inhomogeneous strains with strain gradient above 107/m. These giant disclination strains significantly broaden the 90° domain walls, while the flexoelectric coupling at 180° domain wall is less affected. The present observations are helpful for understanding the basics of topological dipole textures and indicate novel applications of ferroelectrics through engineering strains.

  • Functionalization of Graphene

  • M.F. Chisholm, Jaekwang Lee, Junjie Guo, Zhiqing Yang, S.J. Pennycook, S.T. Pantelides, Wu Zhou
  • Journal:
    Microscopy and Microanalysis / Volume 21 / Issue S3 / August 2015
    Published online by Cambridge University Press:
    23 September 2015, pp. 737-738
    Print publication:
    August 2015
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  • Stabilization of Nanopores in Graphene

  • J.K Lee, Z.Q. Yang, W. Zhou, S.J. Pennycook, S.T. Pantelides, M.F. Chisholm
  • Journal:
    Microscopy and Microanalysis / Volume 20 / Issue S3 / August 2014
    Published online by Cambridge University Press:
    27 August 2014, pp. 1732-1733
    Print publication:
    August 2014
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  • Quantification of Cation Ordering in La2-2xSr1+2xMn2O7 by STEM EELS

  • M.P. Oxley, M.A. Roland, M. Varela, S.J. Pennycook
  • Journal:
    Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
    Published online by Cambridge University Press:
    09 October 2013, pp. 1912-1913
    Print publication:
    August 2013
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  • Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

  • Origin of Ferromagnetism in Perovskite Cobaltites

  • T. Kishida, S.J. Pennycook, M.F. Chisholm
  • Journal:
    Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
    Published online by Cambridge University Press:
    09 October 2013, pp. 1962-1963
    Print publication:
    August 2013
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  • Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

  • Low Voltage STEM for the Study of Defects in 2D Materials

  • W. Zhou, J. Lee, M.D. Kapetanakis, M.P. Prange, A.R. Lupini, S.T. Pantelides, J.-C. Idrobo, S.J. Pennycook
  • Journal:
    Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
    Published online by Cambridge University Press:
    09 October 2013, pp. 1232-1233
    Print publication:
    August 2013
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  • Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

  • Single Atom Niobium in Graphitic Layers for Enhanced Oxygen Reduction Reaction

  • J. Guo, X. Zhang, P. Guan, C. Liu, H. Huang, F. Xue, X. Dong, S.J. Pennycook, M.F. Chisholm
  • Journal:
    Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
    Published online by Cambridge University Press:
    09 October 2013, pp. 1680-1681
    Print publication:
    August 2013
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  • Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

  • STEM EELS Resolution Revisited

  • M.P. Oxley, S.J. Pennycook
  • Journal:
    Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
    Published online by Cambridge University Press:
    09 October 2013, pp. 608-609
    Print publication:
    August 2013
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  • Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

  • AB/AC Stacking Boundaries in Bilayer Graphene

  • J. Lin, W. Zhou, W. Fang, J. Kong, A.R. Lupini, J.C. Idrobo, S.J. Pennycook, S.T. Pantelides
  • Journal:
    Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
    Published online by Cambridge University Press:
    09 October 2013, pp. 1942-1943
    Print publication:
    August 2013
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  • Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

  • High-Resolution STEM Analysis of Nanoparticle Materials

  • A.R. Lupini, G.M. Veith, C. Li, V. Iberi, J. Camden, S.J. Pennycook
  • Journal:
    Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
    Published online by Cambridge University Press:
    09 October 2013, pp. 1438-1439
    Print publication:
    August 2013
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  • Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

  • Quantitative Low-Voltage STEM imaging in the Presence of Temporal Incoherence

  • M.P. Oxley, S.J. Pennycook
  • Journal:
    Microscopy and Microanalysis / Volume 19 / Issue S2 / August 2013
    Published online by Cambridge University Press:
    09 October 2013, pp. 1216-1217
    Print publication:
    August 2013
    • Article
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  • Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Page 1 of 4