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Self-assembled oxide nanopillars in epitaxial thin films for vortex pinning
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10.1063/1.3532107
/content/aip/journal/apl/98/4/10.1063/1.3532107
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/4/10.1063/1.3532107
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Figures

Image of FIG. 1.
FIG. 1.

(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 [100] 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 [001] 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.

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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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/content/aip/journal/apl/98/4/10.1063/1.3532107
2011-01-27
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Self-assembled oxide nanopillars in epitaxial BaFe2As2 thin films for vortex pinning
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/4/10.1063/1.3532107
10.1063/1.3532107
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