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We analysed the flux-flow region of isofield magneto resistivity dataobtained on three crystals of BaFe$_{2-x}$Ni$_x$As$_2$ with $T_c$$\sim$20 K forthree different geometries relative to the angle formed between the appliedmagnetic field and the c-axis of the crystals. The field dependent activationenergy, $U_0$, was obtained from the TAFF and modified vortex-glass models,which were compared with the values of $U_0$ obtained from flux-creep availablein the literature. We observed that the $U_0$ obtained from the TAFF model showdeviations among the different crystals, while the correspondent glass linesobtained from the vortex glass model are virtually coincident. It is shown thatthe data is well explained by the modified vortex glass model, allowing toextract values of $T_g$, the glass transition temperature, and $T^*$, atemperature which scales with the mean field critical temperature $T_c(H)$. Theresulting glass lines obey the anisotropic Ginzburg-Landau theory and are wellfitted by a theory developed in the literature by considering the effect ofdisorder.

Flux-flow and vortex-glass phase in iron pnictide BaFe$_{2-x}$Ni$_x$As$_2$ single crystals with $T_c$ $\sim$ 20 K