Electron cooling in diffusive normal metal-superconductor tunnel junctions with a spin-valve ferromagnetic interlayer

We investigate heat and charge transport through a diffusive SIF 1F 2N tunnel junction, where N (S) is a normal (superconducting) electrode, I is an insulator layer, and F 1,2 are two ferromagnets with arbitrary direction of magnetization. The flow of an electric current in such structures at subgap...

Descripción completa

Detalles Bibliográficos
Autores: Ozaeta, A., Vasenko, Andrey S., Hekking, F. W. J., Bergeret, F. Sebastian
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::d010fffb8d1854718c46dab93a55b9f1
Acceso en línea:http://hdl.handle.net/10261/101998
Access Level:acceso abierto
id ES_4e0e8d02e1e1ce314d0171fa8bd2acf1
oai_identifier_str oai:dnet:digitalcsic_::d010fffb8d1854718c46dab93a55b9f1
network_acronym_str ES
network_name_str España
repository_id_str
spelling Electron cooling in diffusive normal metal-superconductor tunnel junctions with a spin-valve ferromagnetic interlayerOzaeta, A.Vasenko, Andrey S.Hekking, F. W. J.Bergeret, F. SebastianWe investigate heat and charge transport through a diffusive SIF 1F 2N tunnel junction, where N (S) is a normal (superconducting) electrode, I is an insulator layer, and F 1,2 are two ferromagnets with arbitrary direction of magnetization. The flow of an electric current in such structures at subgap bias is accompanied by a heat transfer from the normal metal into the superconductor, which enables refrigeration of electrons in the normal metal. We demonstrate that the refrigeration efficiency depends on the strength of the ferromagnetic exchange field h and the angle α between the magnetizations of the two F layers. As expected, for values of h much larger than the superconducting order parameter Δ, the proximity effect is suppressed and the efficiency of refrigeration increases with respect to a NIS junction. However, for h∼Δ the cooling power (i.e., the heat flow out of the normal metal reservoir) has a nonmonotonic behavior as a function of h showing a minimum at hΔ. We also determine the dependence of the cooling power on the lengths of the ferromagnetic layers, the bias voltage, the temperature, the transmission of the tunneling barrier, and the magnetization misalignment angle α. © 2012 American Physical Society.This work was supported by the Spanish Ministry of Economy and Competitiveness under Project No. FIS2011-28851-C02-02 and the Basque Government under UPV/EHU Project IT-366-07. The work of A.O. was supported by the Spanish National Research Council (CSIC) and the European Social Fund under JAE-Predoc program.Peer ReviewedAmerican Physical SocietyMinisterio de Economía y Competitividad (España)Eusko JaurlaritzaUniversidad del País VascoEuropean CommissionConsejo Superior de Investigaciones Científicas (España)2014201420122014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/101998reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1103/PhysRevB.85.174518info:eu-repo/semantics/openAccessoai:dnet:digitalcsic_::d010fffb8d1854718c46dab93a55b9f12026-05-22T06:33:51Z
dc.title.none.fl_str_mv Electron cooling in diffusive normal metal-superconductor tunnel junctions with a spin-valve ferromagnetic interlayer
title Electron cooling in diffusive normal metal-superconductor tunnel junctions with a spin-valve ferromagnetic interlayer
spellingShingle Electron cooling in diffusive normal metal-superconductor tunnel junctions with a spin-valve ferromagnetic interlayer
Ozaeta, A.
title_short Electron cooling in diffusive normal metal-superconductor tunnel junctions with a spin-valve ferromagnetic interlayer
title_full Electron cooling in diffusive normal metal-superconductor tunnel junctions with a spin-valve ferromagnetic interlayer
title_fullStr Electron cooling in diffusive normal metal-superconductor tunnel junctions with a spin-valve ferromagnetic interlayer
title_full_unstemmed Electron cooling in diffusive normal metal-superconductor tunnel junctions with a spin-valve ferromagnetic interlayer
title_sort Electron cooling in diffusive normal metal-superconductor tunnel junctions with a spin-valve ferromagnetic interlayer
dc.creator.none.fl_str_mv Ozaeta, A.
Vasenko, Andrey S.
Hekking, F. W. J.
Bergeret, F. Sebastian
author Ozaeta, A.
author_facet Ozaeta, A.
Vasenko, Andrey S.
Hekking, F. W. J.
Bergeret, F. Sebastian
author_role author
author2 Vasenko, Andrey S.
Hekking, F. W. J.
Bergeret, F. Sebastian
author2_role author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Eusko Jaurlaritza
Universidad del País Vasco
European Commission
Consejo Superior de Investigaciones Científicas (España)
description We investigate heat and charge transport through a diffusive SIF 1F 2N tunnel junction, where N (S) is a normal (superconducting) electrode, I is an insulator layer, and F 1,2 are two ferromagnets with arbitrary direction of magnetization. The flow of an electric current in such structures at subgap bias is accompanied by a heat transfer from the normal metal into the superconductor, which enables refrigeration of electrons in the normal metal. We demonstrate that the refrigeration efficiency depends on the strength of the ferromagnetic exchange field h and the angle α between the magnetizations of the two F layers. As expected, for values of h much larger than the superconducting order parameter Δ, the proximity effect is suppressed and the efficiency of refrigeration increases with respect to a NIS junction. However, for h∼Δ the cooling power (i.e., the heat flow out of the normal metal reservoir) has a nonmonotonic behavior as a function of h showing a minimum at hΔ. We also determine the dependence of the cooling power on the lengths of the ferromagnetic layers, the bias voltage, the temperature, the transmission of the tunneling barrier, and the magnetization misalignment angle α. © 2012 American Physical Society.
publishDate 2012
dc.date.none.fl_str_mv 2012
2014
2014
2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/101998
url http://hdl.handle.net/10261/101998
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1103/PhysRevB.85.174518
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869407731766525952
score 15,812429

Similares en LA Referencia