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We examine the dynamics of skyrmions in systems with a region of strongpinning coexisting with a pin free region, where the equilibrium state has auniform skyrmion density. Under an applied drive, skyrmions accumulate in thepin free region along the edge of the pinned region due to the skyrmion Halleffect. As the drive increases, a series of dynamical structural transitionsoccur in the flowing skyrmion lattice similar to those observed in thecompression dynamics of crystals. These transitions correspond to reductions inthe number of flowing rows of skyrmions due to the collective motion of theskyrmions into the pinned region, and they are accompanied by a series of stepsin the velocity force curves. When the number of pinning sites is sufficientlylarge, a drive induced pinning effect can occur when the skyrmion Hall effectforces all of the skyrmions to enter the strongly pinned region. This reentrantpinning effect becomes more pronounced for increasing intrinsic skyrmion Hallangle.

Reentrant Pinning, Dynamic Row Reduction, and Skyrmion Accumulation for Driven Skyrmions in Inhomogeneous Pinning Arrays