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Atomic scale investigation of a PbTiO3/SrRuO3/DyScO3 heterostructure
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) HAADF-STEM overview image of the sample. The surface structure of the PbTiO film and the SrRuO nanowires of ∼5 × 120 nm size is distinct. (b) Colored elemental map with Ti (blue), Ru (light-blue), and Sc (red). (c) Magnified image of a nanowire ending showing the and domains in the PbTiO film. Domain walls in the film (white dashed-lines) occur (mostly) at the end of the nanowires. The horizontal dashed-line indicates the bending of an atomic plane through -domains.

Image of FIG. 2.
FIG. 2.

(a) High resolution HAADF-STEM image taken shows two dark bands in both PbTiO/SrRuO and SrRuO/DyScO interfaces indicated by arrows. (b) Line profiles across a SrRuO nanowire indicate the atomic sequence in both interfaces (regions 1 and 2) with alternating Pb-Sr-Dy (blue) and Ti-Ru-Sc (red). Line profiles in a region without nanowire (regions 3) show alternating Pb-Dy (blue) and Ti-Sc (red). The insets 1, 2, and 3 in (a) indicate the simulated images.

Image of FIG. 3.
FIG. 3.

((a), (b)-left) Elemental maps of Dy-L, Sc-L, Ru-M, and Ti-L edges (gray scaled) together with the corresponding color map with Dy (green), Sc (red), Ru (light-blue), and Ti (blue) from (a) region 1, 2 and (b) region 3. (c) Atomic elemental line profiles with Dy (green), Sc (red), Ru (light-blue), Sr (pink), and Ti (blue) crossing the interfaces.

Image of FIG. 4.
FIG. 4.

EELS spectra of Ti-L, Sc-L, and O K edges across the SrRuO nanowire. Subtle changes are observed as a result of an electronic-structure reconstruction at the PbTiO/SrRuO and SrRuO/DyScO interfaces.

Image of FIG. 5.
FIG. 5.

3D model of the growth system: (a) Perovskite building blocks of DyScO, SrRuO, PbTiO, and SrTiO. AO and BO layers are shown in a distinct color. (b) SrRuO grows preferentially on Sc-terminated DyScO substrate steps. (c) Epitaxial growth of the PbTiO film inducing an unexpected 3 unit cells of SrTiO.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Atomic scale investigation of a PbTiO3/SrRuO3/DyScO3 heterostructure