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(Color online) (a) Angular dependence of J c for the Ba(Fe $^{1}$− x Co x ) 2 As 2 film at 4.2 K under several magnetic fields. J c exhibits a broad maximum centered at H ⊥ c . No additional peaks except at H ⊥ c were observed. The solid and broken red lines represent the random defect and intrin- sic contribution at 9 T, respectively. (b) All J c data can be scaled with an anisotropy parameter of γ ranging from 1.5 ∼ 2 at given temperatures except for the angular range close to H ⊥ c . In summary, we have investigated transport properties of Co-containing Ba-122 thin films deposited on insulat- ing LSAT substrates. TEM microstructural observation revealed that a thin epitaxial Fe layer was present at the film/substrate interface. Despite of the Fe layer be- The angular-dependent upper critical field, H$_{c2}$ (Θ), at 21.5 K, shown in fig. 4 (a), was determined from the on- set of superconductivity defined as a 90% of the nor- mal resistance at 25 K. The resulting H$_{c2}$ (Θ) exhib- ited a maximum at Θ=90 ◦ ( H ab $_{c2}$) and a minimum at Θ=180 ◦ ( H c $_{c2}$). For comparison, we show a calcula- tion based on the anisotropic Ginzburg-Landau (GL) theory, H$_{c2}$ (Θ)= H c $_{c2}$(cos$^{2}$(Θ) + sin$^{2}$(Θ) /γ $^{2}$) $_{−}$0 . $^{5}$,with γ = H ab $_{c2}$/H c $_{c2}$. Clearly, the GL expression fits very well the measured H$_{c2}$ (Θ) similar to ref. $^{23}$, which is in contrast to the results of two-band MgB$_{2}$ superconductors in the dirty limit. 24 Shown in fig. 4 (b) is the γ values evaluated by two different methods, in which the Blatter scaling approach for the J$_{c}$ (Θ, H ) at low T , where the finite J$_{c}$ can be measured and for the H$_{c2}$ (Θ) at high T , where µ$_{0}$H$_{c2}$ < 9 T, as a function of temperature. It is clear from fig. 4 (b) that γ is increasing with increasing tem- perature, which is consistent with dominant inter-band scattering. However, the experimental data deviate from the cal- culation in the range of 100 ◦ to 110 ◦ (70 ◦ to 80 ◦ ) and this deviation becomes larger with increasing temperature or decreasing magnetic field. Plausible reasons for this de- viation may originate from either a gradual breakdown of the Tachiki-Takahashi model due to the small anisotropy or the Pearl vortices due to a thinner film thickness than the penetration depth. 22 On the other hand, J$_{c}$ (Θ) owing to the intrinsic pin- ning described above may be expressed by the Tachiki- Takahashi model (i.e. J$_{c}$ (Θ)= J$_{c}$ (180 ◦ ) | cos(Θ) | $_{−}$0 . $^{5}$).21 It is clear that the measured J$_{c}$ (Θ) in the angular region close to 90 ◦ can be fitted by this model as shown in the fig. 3 (a) (see red broken lines). In the absence of correlated defects, (i.e. if only the mass anisotropy is responsible for the J$_{c}$ anisotropy) J$_{c}$ can be scaled with H$_{eff}$ , ( H$_{eff}$ = Hϵ (Θ), ϵ (Θ) = √ cos $^{2}$(Θ) + γ $^{$_{−}$2}$sin $^{2}$(Θ)), where γ is the mass anisotropy ratio. 18 This was, for instance, applied to one-band Y-123 by L. Civale et al 19 and two-band MgB$_{2}$ superconducting films in the dirty limit by S. Sen et al , 20 however, J$_{c}$ (Θ) for the latter films can not be scaled below 33 K. The scaling behavior of J$_{c}$ (Θ) as a function of H$_{eff}$ at various temperatures is exhibited in fig. 3 (b). All data except in the vicinity of H ⊥ c collapse onto a single curve with rel- atively small anisotropies, γ , of 1.5-2. This means that random defects are dominant in those regions, whereas a failure to scale the data close to H ⊥ c is owing to the intrinsic pinning, which originates from the modulation of the superconducting order parameter along the c -axis. Here, the value of the out-of-plane coherence length ξ$_{c}$ for the Co-containing Ba-122 is almost equivalent to its lattice constant c . Once the J$_{c}$ ( H$_{eff}$ ) has been obtained (i.e. collapsed data in fig. 3 (b)), J$_{c}$ owing to random de- fects can be re-plotted in the angular dependent J$_{c}$ . The solid line in fig. 3 (a) is an example at 4.2 K and µ$_{0}$H =9 T of J$_{c}$ due to random defects. Ba-122 films, which led to enormous J$_{c}$ peaks for H ‖ c . This discrepancy may originate from the different deposi- tion condition such as temperature and PLD target com- position. According to ref. $^{17}$, the Co content in Ba-122 significantly influences the superconducting properties. For instance, under-doped Ba(Fe$_{1}$$_{−}$$_{x}$Co$_{x}$)$_{2}$As$_{2}$ ( x =0.054) single crystals show a large J$_{c}$ of over 10 $^{5}$Acm $_{−}$2 at T = 0 . 7 T$_{c}$ and H$_{m}$ ( H$_{m}$ is the field of fishtail magne- tization maximum in the hysteresis loop) due to struc- tural domains, whereas the corresponding value of the over-doped crystals ( x =0.086) exhibited one order mag- nitude lower values albeit the former crystal showed a lower T$_{c}$ of 19.2 K than the latter one ( T$_{c}$ =20.5 K). The film composition in this study may be located further in the over-doped region compared with the PLD target, since Fe has been consumed during film deposition. 3