Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices

Abstract Magnetic skyrmions are whirl-like nano-objects with topological protection. When driven by direct currents, move but experience a transverse deflection. This so-called skyrmion Hall effect is often regarded drawback for memory applications. Herein, we show that this unique can also be favorable spintronic applications: We in racetrack broken inversion symmetry, the allows to translate an alternating current into directed motion along track, like ratchet. analyze several modes of ratchet mechanism and it magnetic whirls. elaborate on fundamental differences compared topologically trivial objects, as well classical particles periodic forces. Depending exact geometry, soft or strict. In latter case, propagates close efficiency maximum.