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Transition from laminar to three-dimensional growth mode in pulsed laser deposited BiFeO3 film on (001) SrTiO3
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Image of FIG. 1.
FIG. 1.

(a) Schematic of real time x-ray scattering geometry during the growth of BiFeO3 films on SrTiO3 substrate. The incident x-ray beam (wave vector ki ) impinges on the sample surface at an incidence angle of α and the scattered beam (wave vector kf ) scatters at angle β. The wave-vector transfer is denoted by Q = kf ki , which is indicated as a solid blue line for the specular diffracted (α = β) x-rays, and dashed magenta line for the diffuse scattered x-rays. An x-ray area detector covers a tilted portion of the Ewald sphere, resulting in an x-ray pattern with projections in Qx, Qy, and Qz. (b) Two-dimensional image of the (00 0.5) reciprocal position of the starting SrTiO3 substrate. This is a frame from a time scan during the deposition of the BiFeO3 film referred to as sample A 18 (enhanced online). [URL: http://dx.doi.org/10.1063/1.4765363.1]doi: 10.1063/1.4765363.1.

Image of FIG. 2.
FIG. 2.

(a) and (c) are (00 0.5) specular and diffuse integrated intensities for samples A and B, respectively. (b) and (d) are Qy profiles for the same data for sample A and B, respectively. The dashed vertical lines represent the start and end of the depositions. Deposition is started at 100 s in each case for a total deposition time of 225 s for sample A, and 850 s for sample B.

Image of FIG. 3.
FIG. 3.

Time slices of in-plane momentum transfer vector Qy for sample A where the times 174 s, 234 s, and 284 s correspond to first maximum, second minimum, second maximum, respectively, of the growth oscillations in Fig. 2(a) . The arrow indicates change in Qy at different stages during film growth.

Image of FIG. 4.
FIG. 4.

AFM images of BiFeO3 on (001) SrTiO3 taken postdeposition for (a) sample A, (b) sample B.



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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Transition from laminar to three-dimensional growth mode in pulsed laser deposited BiFeO3 film on (001) SrTiO3