High critical current density in BaAs$_{2}$(Fe,Co)$_{2}$ thin films up to 35 T

In the Co-doped BaFe$_{2}$As$_{2}$ thin films we intensively investigated field and angular dependences of J$_{c}$ down 4.2 K in high field. We found a strong correlated c-axis pinning and Jc for field along the c-axis exceeds J$_{c}$ for H//ab plane up to $\sim $20T, inverting the expectation of the Hc2 anisotropy. As a consequence the angular dependence is very weak and J$_{c}$ is still over 10$^{5}$ A/cm$^{2}$ at 20T. Moreover the maximum pinning force F$_{p}$(4.2K) reaches 35-40 GN/m$^{3}$ at 15-20T depending on the field configuration, indicative of strong high-field vortex pinning. High resolution transmission electron microscopy reveals that the strong vortex pinning is due to a high density of non-superconducting Ba-Fe-O nanocolumnar defects whose diameter is $\sim $2$\xi $, perfect conditions for a strong pinning.