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Ratchet devices allow turning an ac input signal into a dc output signal. Aratchet device is set by moving particles driven by zero averages forces onasymmetric potentials. Hybrid nanostructures combining artificially fabricatedspin-ice nanomagnet arrays with superconducting films have been identified as agood choice to develop ratchet nanodevices. In our case, the asymmetricpotentials are provided by charged N\'eel walls located in the vertices of themagnetic honeycomb array, whereas the role of moving particles is played bysuperconducting vortices. We have experimentally obtained ratchet effect fordifferent spin ice I configurations and for vortex lattice moving parallel orperpendicular to the magnetic easy axes. Remarkably, the ratchet magnitudes aresimilar in all the experimental runs; i. e. different spin ice I configurationsand in both relevant directions of the vortex lattice motion. We have simulatedthe interplay between vortex motion directions and a single asymmetricpotential. It turns out vortices interact with uneven asymmetric potentials,when they move with trajectories crossing charged N\'eel walls with differentorientations. Moreover, the appropriate asymmetric pair potentials whichgenerate the local ratchet effect have been identified. In this rocking ratchetthe particles (vortices) on the move are interacting each other (vortexlattice); therefore, the ratchet local effect turns into a global macroscopiceffect. In summary, this ratchet device benefits from interacting particlesmoving in robust and topological protected type I spin ice landscapes.

Realization of macroscopic ratchet effect based on nonperiodic and uneven potentials