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Photochemical switching of ultrathin films
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) and (b) show high resolution linear and scans before and after photochemical treatment, respectively. After treatment, the satellites are missing in the profiles, suggesting an effective switching from a stripe-domain to a monodomain state. The inset in (a) shows that annealing reintroduces the stripe-domain state in a thin film.

Image of FIG. 2.
FIG. 2.

Thickness dependence of the -axis lattice constant and tetragonality of films before and after photochemical treatment. The photochemical treatment effectively increases the (001) lattice constant and hence the tetragonality, since the in-plane lattice constant is unchanged by this treatment. Open and solid circles refer to the tilted and non-tilted reciprocal lattice, respectively. The inset shows the linear profiles of 8 and 14 unit cell thick films, before (blue) and after (red) photochemical treatment.

Image of FIG. 3.
FIG. 3.

(a) and (b) show the reciprocal space map of a 29 unit cell thick films before and after photochemical treatment, respectively. For the as-grown sample the value is modulated periodically with even and odd values of the Miller index . This corresponds to a -modulated reciprocal space lattice. The (103) tilt angle is determined at 0.65°. (c) Schematic illustration of the photochemical switching linked with the change in crystalline symmetry.

Image of FIG. 4.
FIG. 4.

Thickness dependence of the tilt angle between the (103) and (003) reflections, before and after photochemical treatment. After the photochemical treatment, the tilt angle is suppressed, although a small tilt distortion is still observed for the thinnest samples.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Photochemical switching of ultrathin PbTiO3 films