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Real-space Imaging of Ferroelectric and Structural Antiphase Domains in Hexagonal YMnO<sub>3</sub>
Keisuke Kobayashi,Hideki Kamo,Kosuke Kurushima,Yoichi Horibe,정상욱,Yoshihiko Togawa,Shigeo Mori 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
A high-angle annular-dark-field (HAADF) imaging technique was applied to the investigation of domain wall structures in the ferroelectric phase of hexagonal manganites, YMnO<sub>3</sub>, on an atomic scale. The displacements of the Y<sup>3+</sup> ions along the [001] direction can be clearly visualized. The ferroelectric dipole moments are revealed to be caused by the opposite and unequal displacements of Y<sup>3+</sup> ions. Two types of domain walls should be identified in the ferroelectric domain structures. One is charged longitudinal domain walls with head-to-head or tail-to-tail configurations and the other is non-charged transverse domain walls with head-to-tail configurations. In addition, the ferroelectric and the structural antiphase domains in YMnO<sub>3</sub> change into fragmentary domains because of substitution of Ti<sup>4+</sup> for Mn<sup>3+</sup>, and ferroelectric nanodomains with sizes of 10 - 20 nm are found in the x = 0.30 compound.