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(a) The cross-sectional TEM image of Co-doped Ba-122 film grown on 100 u.c. STO/LSAT. This image is viewed along the  zone axis. The inset at the top left is the corresponding SAED pattern. (b) A magnified region of the line defects near the film/STO interface. (c) The planar view bright field TEM image viewed along the  zone axis. The corresponding SAED pattern inset at the bottom left shows a single crystal pattern. (d) A high resolution STEM image of (c) showing the structure of the nanopillars in the Ba-122 film. (e) A high angle annular dark field (Z-contrast) image showing the atomic structure of an epitaxial nanopillar in the Ba-122 film.
(a) HAADF image showing the analyzed region which includes both a nanopillar and the Ba-122 matrix. (b) The change of the atomic ratio of Ba, Fe, As, and O along the line in (a). Relative composition maps for Ba, Fe, As, and O are shown in (c)–(f), respectively.
Schematic models showing the growth process of the nanopillars in the Ba-122 matrix. (a) Nanosized oxide islands nucleate on the surface of STO template. (b) Nanopillars of uniform diameter embed in the fully grown Ba-122 matrix. (c) The nanopillar is coherently strained by the surrounding Ba-122 matrix.
Magnetization as a function of magnetic field at 4.2 K with the field applied perpendicular to the plane of the film for the Ba-122 film on 100 u.c. STO/LSAT. The change in slope at corresponds to .
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