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Atomic-scale mapping of dipole frustration at 90° charged domain walls in ferroelectric PbTiO3 films.

Tang YL, Zhu YL, Wang YJ, Wang WY, Xu YB, Ren WJ, Zhang ZD, Ma XL - Sci Rep (2014)

Bottom Line: Besides the well-accepted head-to-tail 90° uncharged domain-walls, we have identified not only head-to-head positively charged but also tail-to-tail negatively charged domain-walls.The widths, polarization distributions, and strains across these charged domain-walls are mapped quantitatively at atomic scale, where remarkable difference between these domain-walls is presented.This study is expected to provide fundamental information for understanding numerous novel domain-wall phenomena in ferroelectrics.

View Article: PubMed Central - PubMed

Affiliation: 1] Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, 110016 Shenyang, China [2].

ABSTRACT
The atomic-scale structural and electric parameters of the 90° domain-walls in tetragonal ferroelectrics are of technological importance for exploring the ferroelectric switching behaviors and various domain-wall-related novel functions. We have grown epitaxial PbTiO3/SrTiO3 multilayer films in which the electric dipoles at 90° domain-walls of ferroelectric PbTiO3 are characterized by means of aberration-corrected scanning transmission electron microscopy. Besides the well-accepted head-to-tail 90° uncharged domain-walls, we have identified not only head-to-head positively charged but also tail-to-tail negatively charged domain-walls. The widths, polarization distributions, and strains across these charged domain-walls are mapped quantitatively at atomic scale, where remarkable difference between these domain-walls is presented. This study is expected to provide fundamental information for understanding numerous novel domain-wall phenomena in ferroelectrics.

No MeSH data available.


Quantitative analysis of the structural and electric parameters of the 90° PCDW and 90° UCDW.The structural and electric parameters were averaged along {110} (pseudo-cubic) to insure the statistical analysis is parallel to the DWs. (a)–(d) Lattice parameters, tetragonality, δTi and Ps extracted from the rhombus-highlighted area marked with ‘1' in Fig. 1a. (e)–(h) Lattice parameters, tetragonality, δTi and Ps extracted from the rhombus-highlighted area marked with ‘2' in Fig. 1a. The error bars show the standard deviation with respect to averaging along {110}PTO for each {110} atomic row. The inset in (f) shows the schematic definition of out-of-plane (δTiY) and in-plane (δTiX) components of the δTi, respectively.
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f2: Quantitative analysis of the structural and electric parameters of the 90° PCDW and 90° UCDW.The structural and electric parameters were averaged along {110} (pseudo-cubic) to insure the statistical analysis is parallel to the DWs. (a)–(d) Lattice parameters, tetragonality, δTi and Ps extracted from the rhombus-highlighted area marked with ‘1' in Fig. 1a. (e)–(h) Lattice parameters, tetragonality, δTi and Ps extracted from the rhombus-highlighted area marked with ‘2' in Fig. 1a. The error bars show the standard deviation with respect to averaging along {110}PTO for each {110} atomic row. The inset in (f) shows the schematic definition of out-of-plane (δTiY) and in-plane (δTiX) components of the δTi, respectively.

Mentions: A careful observation indicates that, on both structural and electric level, the 90° PCDW is rather wider than the 90° UCDW. According the famous Kittel's law, the DW width is a crucial factor for determining the DW patterns and thus the properties such as nonlinear electro-optics3. The local behaviors of the present 90° PCDW (rhombus-highlighted area labeled ‘2' in the lower left of figure 1a) are comparatively studied with the 90° UCDW (rhombus-highlighted area labeled ‘1' in the upper left of figure 1a), and the average data are obtained along PTO{110}p (subscript p denotes pseudo-cubic), which is generally thought to be the location of 90° DWs in tetragonal ferroelectrics222324. The magnitudes of Ps vectors are determined by corresponding δTi because the relationship between the δTi and the Ps is well-known33. The image drifting are calibrated with reference to the lattice parameter (a = 0.5488 nm, ref. 43) of the orthorhombic GSO substrate (not shown here). The structural and polar characters of the 90° UCDW at the upper left of figure 1a (The wall that separates domain A and domain B) are shown in figure 2a–d.


Atomic-scale mapping of dipole frustration at 90° charged domain walls in ferroelectric PbTiO3 films.

Tang YL, Zhu YL, Wang YJ, Wang WY, Xu YB, Ren WJ, Zhang ZD, Ma XL - Sci Rep (2014)

Quantitative analysis of the structural and electric parameters of the 90° PCDW and 90° UCDW.The structural and electric parameters were averaged along {110} (pseudo-cubic) to insure the statistical analysis is parallel to the DWs. (a)–(d) Lattice parameters, tetragonality, δTi and Ps extracted from the rhombus-highlighted area marked with ‘1' in Fig. 1a. (e)–(h) Lattice parameters, tetragonality, δTi and Ps extracted from the rhombus-highlighted area marked with ‘2' in Fig. 1a. The error bars show the standard deviation with respect to averaging along {110}PTO for each {110} atomic row. The inset in (f) shows the schematic definition of out-of-plane (δTiY) and in-plane (δTiX) components of the δTi, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3927212&req=5

f2: Quantitative analysis of the structural and electric parameters of the 90° PCDW and 90° UCDW.The structural and electric parameters were averaged along {110} (pseudo-cubic) to insure the statistical analysis is parallel to the DWs. (a)–(d) Lattice parameters, tetragonality, δTi and Ps extracted from the rhombus-highlighted area marked with ‘1' in Fig. 1a. (e)–(h) Lattice parameters, tetragonality, δTi and Ps extracted from the rhombus-highlighted area marked with ‘2' in Fig. 1a. The error bars show the standard deviation with respect to averaging along {110}PTO for each {110} atomic row. The inset in (f) shows the schematic definition of out-of-plane (δTiY) and in-plane (δTiX) components of the δTi, respectively.
Mentions: A careful observation indicates that, on both structural and electric level, the 90° PCDW is rather wider than the 90° UCDW. According the famous Kittel's law, the DW width is a crucial factor for determining the DW patterns and thus the properties such as nonlinear electro-optics3. The local behaviors of the present 90° PCDW (rhombus-highlighted area labeled ‘2' in the lower left of figure 1a) are comparatively studied with the 90° UCDW (rhombus-highlighted area labeled ‘1' in the upper left of figure 1a), and the average data are obtained along PTO{110}p (subscript p denotes pseudo-cubic), which is generally thought to be the location of 90° DWs in tetragonal ferroelectrics222324. The magnitudes of Ps vectors are determined by corresponding δTi because the relationship between the δTi and the Ps is well-known33. The image drifting are calibrated with reference to the lattice parameter (a = 0.5488 nm, ref. 43) of the orthorhombic GSO substrate (not shown here). The structural and polar characters of the 90° UCDW at the upper left of figure 1a (The wall that separates domain A and domain B) are shown in figure 2a–d.

Bottom Line: Besides the well-accepted head-to-tail 90° uncharged domain-walls, we have identified not only head-to-head positively charged but also tail-to-tail negatively charged domain-walls.The widths, polarization distributions, and strains across these charged domain-walls are mapped quantitatively at atomic scale, where remarkable difference between these domain-walls is presented.This study is expected to provide fundamental information for understanding numerous novel domain-wall phenomena in ferroelectrics.

View Article: PubMed Central - PubMed

Affiliation: 1] Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, 110016 Shenyang, China [2].

ABSTRACT
The atomic-scale structural and electric parameters of the 90° domain-walls in tetragonal ferroelectrics are of technological importance for exploring the ferroelectric switching behaviors and various domain-wall-related novel functions. We have grown epitaxial PbTiO3/SrTiO3 multilayer films in which the electric dipoles at 90° domain-walls of ferroelectric PbTiO3 are characterized by means of aberration-corrected scanning transmission electron microscopy. Besides the well-accepted head-to-tail 90° uncharged domain-walls, we have identified not only head-to-head positively charged but also tail-to-tail negatively charged domain-walls. The widths, polarization distributions, and strains across these charged domain-walls are mapped quantitatively at atomic scale, where remarkable difference between these domain-walls is presented. This study is expected to provide fundamental information for understanding numerous novel domain-wall phenomena in ferroelectrics.

No MeSH data available.