Villegas, J. E.González Herrera, Elvira MaríaGonzalez, M. P.Anguita, J. V.Vicent López, José Luis2023-06-202023-06-202005-011098-0121https://hdl.handle.net/20.500.14352/52080©2005 The American Physical Society. We want to thank Spanish CICYT MAT2002-04543 and R. Areces Foundation. M.G. wants to thank Ministerio de Educación y Ciencia for a Ramon y Cajal contract.A vortex lattice ratchet effect has been investigated in Nb films grown on arrays of nanometric Ni triangles, which induce periodic asymmetric pinning potentials. The vortex lattice motion yields a net dc voltage when an ac driving current is applied to the sample and the vortex lattice moves through the field of asymmetric potentials. This ratchet effect is studied taking into account the array geometry, the temperature, the number of vortices per unit cell of the array, and the applied ac currents.engjournal articlehttp://dx.doi.org/10.1103/PhysRevB.71.024519https://journals.aps.orgopen access538.9Magnetic-Flux QuantaNb FilmsDotsDefectsMotorsFísica de materialesFísica del estado sólido2211 Física del Estado Sólido