RT Journal Article
T1 Topologically protected superconducting ratchet effect generated by spin-ice nanomagnets
A1 Rollano, V.
A1 Muñoz Noval, Álvaro
A1 Gómez, A.
A1 Valdés Bango, F.
A1 Martín, J.I.
A1 Vélez, M.
A1 Osorio, M. R.
A1 Granados, D.
A1 González Herrera, Elvira María
A1 Vicent López, José Luis
AB 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.
PB IOP Publishing Ltd
SN 0957-4484
YR 2019
FD 2019-06-14
LK https://hdl.handle.net/20.500.14352/13328
UL https://hdl.handle.net/20.500.14352/13328
LA eng
NO ©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.
NO Ministerio de Economía y Competitividad (MINECO)/AEI/FEDER
NO Ministerio de Economía y Competitividad (MINECO)
NO Comunidad de Madrid
NO Centros de Excelencia Severo Ochoa (MINECO)
NO Programa Ramón y Cajal
DS Docta Complutense
RD 4 abr 2025