Topologically protected superconducting ratchet effect generated by spin-ice nanomagnets



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Rollano, V. and Muñoz Noval, Álvaro and Gómez, A. and Valdés Bango, F. and Martín, J.I. and Vélez, M. and Osorio, M. R. and Granados, D. and González Herrera, Elvira María and Vicent López, José Luis (2019) Topologically protected superconducting ratchet effect generated by spin-ice nanomagnets. Nanotechnology, 30 (24). ISSN 0957-4484

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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 Neel walls; (iii) the interaction between superconducting vortices and the asymmetric potentials provided by the Neel 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.

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©2019 IOP Publishing
We thank support from Spanish MINECO grants FIS201676058 (AEI/FEDER, UE), Spanish CM grant S2013/MIT2850. IMDEA Nanociencia acknowledges support from the 'Severo Ochoa' Programme for Centres of Excellence in R&D (MINECO, Grant SEV-2016-0686). DG acknowledges RYC-2012-09864, S2013/MIT-3007 and ESP2015-65597-C4-3-R for financial support and AG acknowledges financial support from Spanish MINECO Grant ESP2015-65597-C4-1-R.

Uncontrolled Keywords:Motion; Memory; State; Motion; State
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:55390
Deposited On:22 May 2019 17:49
Last Modified:14 Jun 2020 23:01

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