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Scanning secondary-electron microscopy on ferroelectric domains and domain walls in YMnO3
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Single-crystal x-ray diffraction spectrum shows the (00 L) reflections, indicating that the YMnO3 crystal is a z-oriented platelet. Inset exhibits a picture of the single crystal. (b) Structural model shows the layered structural feature and ferroelectric polarizations. Oxygen and yttrium atoms are indicated as red and yellow spheres, respectively.

Image of FIG. 2.
FIG. 2.

SEM (a) and PFM (b) images taken from the a-b plane of an YMnO3 crystal, exhibiting the complex vortex domains. The inserted image of (a) illustrates the vortex configuration from Ref. 9.

Image of FIG. 3.
FIG. 3.

(a)-(c) Evolution of domain/wall contrasts in the SEM images under electron-beam irradiation with V 0 = 1 kV. (a) In the initial scanning frames, only domain boundaries are visible. (b) In the successive frames, domain contrasts emerge gradually. (c) The stable saturated state clearly shows the domain contrast. (d) A SEM image demonstrates the microstructure features nearby a grain boundary in YMnO3. It is shown that domain structure depends evidently on the crystal orientation. We can also see a clear critical thickness (Lc) for domain branching in the left part of (d). The inserted image exhibits one of the condensed vortices at a larger magnification to highlight the high-spatial resolution of this technique.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Scanning secondary-electron microscopy on ferroelectric domains and domain walls in YMnO3