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Título:
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Topologically protected superconducting ratchet effect generated by spin-ice nanomagnets
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Autores:
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Rollano, V. ;
Muñoz Noval, Álvaro ;
Gómez, A. ;
Valdés Bango, F. ;
Martín, J.I. ;
Vélez, M. ;
Osorio, M. R. ;
Granados, D. ;
González Herrera, Elvira María ;
Vicent López, José Luis
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Tipo de documento:
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texto impreso
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Editorial:
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IOP publishing ltd, 2019-06-14
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Materia = Ciencias: Física: Física del estado sólido
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Tipo = Artículo
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Resumen:
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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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En línea:
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https://eprints.ucm.es/id/eprint/55390/1/GonzalezH%20EM%2039%20Postprint%2BEMB_14_jun_2020.pdf
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