Topologically protected superconducting ratchet effect generated by spin-ice nanomagnets
arXiv:1807.02331 · doi:10.1088/1361-6528/ab0923
Abstract
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 Néel walls, iii) the interaction between superconducting vortices and the asymmetric potentials provided by the Néel 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.
arXiv comment17 pages, 7 figures
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Cited by in corpus (8)
- Superconducting diode effect via conformal-mapped nanoholes
- Current-Controlled Nanomagnetic Writing for Reconfigurable Magnonic Crystals
- Toroidic phase transitions in a direct-kagome artificial spin ice
- Reconfigurable pinwheel artificial-spin-ice and superconductor hybrid device
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- Amplification of quantum transfer and quantum ratchet
- Magnetic nonreciprocity in a hybrid device of asymmetric artificial spin-ice-superconductors
- Realization of macroscopic ratchet effect based on nonperiodic and uneven potentials