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Arrays of Ni nanodots embedded in Nb superconducting films have beenfabricated by sputtering and electron beam lithography techniques. The arraysare periodic triangular lattices of circular Ni dots arranged in akagom\'e-like pattern with broken reflection symmetry. Relevant behaviors arefound in the vortex lattice dynamics : i) At values lower than the firstinteger matching field, several fractional matching fields are present when thevortex lattice moves parallel or perpendicular to the reflection symmetry axisof the array showing a clear anisotropic character in the magnetoresistancecurves, ii) injecting an ac current perpendicular to the reflection symmetryaxis of the array yields an unidirectional motion of the vortex lattice(ratchet effect) as a result of the interaction between the whole vortexlattice and the asymmetric lattice of dots, iii) increasing the input currentamplitudes the ratchet effect changes polarity independently of matching fieldvalues. These experimental results can be explained taking into account thevortex lattice density.

Vortex ratchet reversal at fractional matching fields in kagom\'e-like array with symmetric pinning centers