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Flux-creep data was obtained for fields along the second magnetization peakobserved in M(H) curves of BaFe{1.9}Ni{0.1}As2 for H||c-axis. H||ab-planes andH forming a 45 degrees angle with ab-planes. The M-H loops from the differentfield directions can be collapsed onto a universal curve with a scaling factorequivalent to the superconducting anisotropy, showing that the pinning is threedimensional, although with remarkable differences in the vortex-dynamics as afunction of field orientation. The resulting relaxation rate, R, when plottedas a function of field and temperature does not show any specific feature inthe vicinity of the second magnetization peak field Hp, the relaxation shows amaximum at a field H_2 well above Hp for H||c and a minimum at H^* for fieldswell below Hp for H||ab$ and H$-45-ab. Isofield plots of the scaled activationenergy obtained from flux-creep data at several different temperatures also donot show any evidence of a change in the pinning mechanism as the peak field iscrossed. The Hp lines in the resulting phase diagrams do not appear to beconsistent with a description-terms of a collective-plastic pinning crossover.

Flux-creep in the second magnetization peak of BaFe{1.9}Ni{0.1}As2 superconductor