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We study the transport of vortices excited by an ac current in an Al filmwith an array of nanoengineered asymmetric antidots. The vortex response to theac current is investigated by detailed measurements of the voltage output as afunction of ac current amplitude, magnetic field and temperature. Themeasurements revealed pronounced voltage rectification effects which are mainlycharacterized by the two critical depinning forces of the asymmetric potential.The shape of the net dc voltage as a function of the excitation amplitudeindicates that our vortex ratchet behaves in a way very different from standardoverdamped models. Rather, as demonstrated by the observed output signal, therepinning force, necessary to stop vortex motion, is considerably smaller thanthe depinning force, resembling the behavior of the so-called inertia ratchets.Calculations based on an underdamped ratchet model provide a very good fit tothe experimental data.Comment: 5 pages, 4 figure

Vortex-Rectification Effects in Films with Periodic Asymmetric Pinning