  We have designed, fabricated and tested a robust superconducting ratchet
device based on topologically frustrated spin-ice nanomagnets. The device is
made of a magnetic Co honeycomb array embedded in a superconducting Nb film.
This device is based on three simple mechanisms: i) the topology of the Co
honeycomb array frustrates in-plane magnetic configurations in the array
yielding a distribution of magnetic charges which can be ordered or disordered
with in-plane magnetic fields, following spin-ice rules, ii) the local vertex
magnetization, which consists of a magnetic half vortex with two charged
magnetic N\'eel walls, iii) the interaction between superconducting vortices
and the asymmetric potentials provided by the N\'eel walls. The combination of
these elements leads to a superconducting ratchet effect. Thus, superconducting
vortices driven by alternating forces and moving on magnetic half vortices
generate a unidirectional net vortex flow. This ratchet effect is independent
of the distribution of magnetic charges in the array.
