2 Furthermore, no additional peaks in the φ -scans of the 103 reflection were observed outside of a sharp, strong peak at every 90 ◦ , as shown in fig. 1 (c). The average FWHM, Δ φ , of the peaks was 1.07 ◦ . A further inves- tigation on the crystalline quality of the film has been performed by transimission electron microscopy, TEM. Shown in figs. 2 (a) and (b) are the cross-sectional TEM images together with its selected area of the electron diffraction (SAED) pattern (c), taken in a C$_{s}$-corrected 300 kV, FEI Titan. Fig. 2 (a), an overview micrograph representative of the entire 10 µ m long TEM lamella sur- veyed, reveals neither appreciable defects nor any grain boudaries. It is further apparent from figs. 2 (c) and 1 (c) that the film grows highly epitaxially with the rela- tion (001)[100]Ba-122 ‖ (001)[100]LSAT without any mis- oriented grains, which was also confirmed from the overall TEM image and pole figure measurements. From these results, we conclude that the Co-containing Ba-122 thin film is clean and of excellent crystalline quality without grain boundaries. The high-resolution TEM image at the interface be- tween the film and substrate reveals a thin epitaxial Fe layer of ≈ 2 nm (fig. 2 (b)). While Fe was not de- tected in the PLD target material by powder X-ray diffraction, the 200 reflection of Fe is commonly ob- served in thin films rather than high-intensity peaks such as 110 or 210, as shown in fig. 1 (a). 5,8,10 These results suggest that Fe is textured and a by-product formed during the deposition. From the above results, the epitaxial relation of the resulting film is (001)[100]Ba- 122 ‖ (001)[110]Fe ‖ (001)[100]LSAT, which was also con- firmed by φ -scans. Here, the lattice constant a of Fe (0.286 nm) multiplied by √$_{2 is close to those of LSAT}$ (0.387 nm) and BaFe$_{1}$$_{.}$$_{8}$Co$_{0}$$_{.}$$_{2}$As$_{2}$ (0.396 nm). Transport J$_{c}$ of the resulting thin film, which shows a T$_{c}$$_{,}$$_{90}$ of 22.3 K with a transition width, Δ T$_{c}$ , of 1.8 K (Δ T$_{c}$ = T$_{c}$$_{,}$$_{90}$ - T$_{c}$$_{,}$$_{10}$ , where T$_{c}$$_{,}$$_{90}$ and T$_{c}$$_{,}$$_{10}$ are defined as 90% and 10% of the normal resistivity at 25 K), as a function of magnetic field at different temperatures has been evaluated. The magnetic field was applied paral- lel and perpendicular to the film c -axis. J$_{c}$ values for H ‖ c are always lower than for H ⊥ c , indicating that the flux pinning is anisotropic. Further investigation of the anisotropy of flux pinning has been done by measuring J$_{c}$ as a function of angle, Θ, under different magnetic fields and temperatures. Shown in fig. 3 (a) is J$_{c}$ (Θ) under dif- ferent magnetic fields at 4.2 K. J$_{c}$ (Θ) always has a broad maximum positioned at Θ=90 ◦ ( H ⊥ c ), and this peak becomes more prominent with increasing magnetic field. These features are typically observed in layered supercon- ductors like Y-123 due to intrinsic pinning arising from correlated ab -planes and a modulation of the supercon- ducting order parameter. 16 Here we emphasize that no J$_{c}$ peaks at Θ=180 ◦ ( H ‖ c ) were observed in the whole range of temperatures as well as magnetic fields, which is consistent with the TEM results (i.e. no c -axis correlated defects were observed, as shown in fig 2 (a).). However, S. Lee et al. 10 have observed c -axis correlated defects on The crystalline quality and phase purity of the thin film was examined prior to detailed transport measure- ments by θ/ 2 θ - scans, 103 φ - scans, and ω - scans of the 004 diffraction peak. It is apparent from fig. 1 (a) that only 00 l peaks of the Co-containing Ba-122 thin film together with the 200 reflection of Fe were observed. The full width at half maximum (FWHM), Δ ω , of the 004 rocking curve was 0.66 ◦ , as exhibited in fig. 1 (b). magnetic field, H , was applied in the maximum Lorentz force configuration ( H perpendicular to J ) at an angle of Θ measured from the c -axis. The same configuration was employed for the angular-and field-dependent resistance measurements near T$_{c}$ to evaluate the upper critical field, H$_{c2}$ . FIG. 2. (Color online) (a) Cross-sectional TEM image of the Co-containing Ba-122 film. No misoriented grains were ob- served. The image was acquired with the beam parallel to LSAT [100]. An arrow points to the interfacial region. (b) HRTEM image of the interfacial region acquired under the same conditions as (a). A 2 nm thick layer of Fe in the [110] zone axis can be seen. This image is exactly 3 nm wide. (c) SAED pattern of the region in (a) revealing the epitaxial rela- tionship between the LSAT substrate and the Co-containing Ba-122 layer. The pattern has been artificially colored to clarify the substrate and film reflections. The lowest order reflections have been indexed. The observed rings correspond to amorphous Pt in the protective surface layer.