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We report the basal-plane critical current and superfluid density ofmagnetically aligned NdFeAsO$_{0.86}$F$_{0.14}$ powder. This sample hasindividual crystallite grains permanently oriented with their c axis along theexternal field. Magnetic irreversibilities at high field suggest strong fluxpinning of basal-plane critical currents, with monotonic field dependence andno evidence of the "fishtail" effect. The small particles provide a sensitiveindicator of \textit{dc} flux penetration, and allow analysis of thetemperature dependence of $ab-$plane London penetration depth$\lambda_{ab,\mathrm{L}}$, which is quadratic at low $T$. This feature may notnecessarily be due to the nodes in the gap, but may be rather a sign of astrong pair-breaking. A quantitative determination of the absolute magnitude of$\lambda_{ab,\mathrm{L}}$ is hindered by the need for accurate knowledge of theparticle size distribution.

Aligned crystallite powder of NdFeAsO$_{0.86}$F$_{0.14}$: magnetic hysteresis and penetration depth