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High quality ferromagnetic 0 and pi Josephson tunnel junctions

hal.structure.identifierCenter of Nanoelectronic Systems for Information Technology [CNI]
dc.contributor.authorWEIDES, M.
hal.structure.identifierPhysikalisches Institut II-Experimentalphysik II
dc.contributor.authorKEMMLER, M.
hal.structure.identifierPhysikalisches Institut II-Experimentalphysik II
dc.contributor.authorGOLDOBIN, E.
hal.structure.identifierPhysikalisches Institut II-Experimentalphysik II
dc.contributor.authorKOELLE, D.
hal.structure.identifierPhysikalisches Institut II-Experimentalphysik II
dc.contributor.authorKLEINER, R.
hal.structure.identifierCenter of Nanoelectronic Systems for Information Technology [CNI]
hal.structure.identifierDepartment of Physics [Berkeley]
hal.structure.identifierDepartment of Materials Science and Engineering [Berkeley]
dc.contributor.authorKOHLSTEDT, H.
hal.structure.identifierCentre de physique moléculaire optique et hertzienne [CPMOH]
hal.structure.identifierInstitut universitaire de France [IUF]
dc.contributor.authorBUZDIN, Alexandre I.
dc.date.created2006-08-24
dc.date.issued2006
dc.identifier.issn0003-6951
dc.description.abstractEnWe fabricated high quality $\Nb/\Al_2\O_3/\Ni_{0.6}\Cu_{0.4}/\Nb$ superconductor-insulator-ferromagnet-superconductor Josephson tunnel junctions. Depending on the thickness of the ferromagnetic $\Ni_{0.6}\Cu_{0.4}$ layer and on the ambient temperature, the junctions were in the 0 or $\pi$ ground state. All junctions have homogeneous interfaces showing almost perfect Fraunhofer patterns. The $\Al_2\O_3$ tunnel barrier allows to achieve rather low damping, which is desired for many experiments especially in the quantum domain. The McCumber parameter $\beta_c$ increases exponentially with decreasing temperature and reaches $\beta_c\approx700$ at $T=2.1 {\rm K}$. The critical current density in the $\pi$ state was up to $5\:\rm{A/cm^2}$ at $T=2.1 {\rm K}$, resulting in a Josephson penetration depth $\lambda_J$ as low as $160\:\rm{\mu m}$. Experimentally determined junction parameters are well described by theory taking into account spin-flip scattering in the $\Ni_{0.6}\Cu_{0.4}$ layer and different transparencies of the interfaces.
dc.language.isoen
dc.publisherAmerican Institute of Physics
dc.title.enHigh quality ferromagnetic 0 and pi Josephson tunnel junctions
dc.typeArticle de revue
dc.identifier.doi10.1063/1.2356104
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Supraconductivité [cond-mat.supr-con]
dc.identifier.arxivcond-mat/0604097
bordeaux.journalApplied Physics Letters
bordeaux.page122511 (1-3)
bordeaux.volume89
bordeaux.peerReviewedoui
hal.identifierhal-00401261
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00401261v1
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