High quality ferromagnetic 0 and pi Josephson tunnel junctions

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dc.creatorWeides, M.
dc.creatorKemmler, M.
dc.creatorKohlstedt, H.
dc.creatorBuzdin, A.
dc.creatorGoldobin, E.
dc.creatorKoelle, D.
dc.creatorKleiner, R.
dc.date2006-04-04
dc.date2006-08-24
dc.date.accessioned2026-07-07T07:05:16Z
dc.date.available2026-07-07T07:05:16Z
dc.descriptionWe fabricated high quality $\Nb/\Al_2Ø_3/\Ni_{0.6}\Cu_{0.4}/\Nb$ 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 $π$ ground state. All junctions have homogeneous interfaces showing almost perfect Fraunhofer patterns. The $\Al_2Ø_3$ tunnel barrier allows to achieve rather low damping, which is desired for many experiments especially in the quantum domain. The McCumber parameter $β_c$ increases exponentially with decreasing temperature and reaches $β_c\approx700$ at $T=2.1 {\rm K}$. The critical current density in the $π$ state was up to $5\:\rm{A/cm^2}$ at $T=2.1 {\rm K}$, resulting in a Josephson penetration depth $λ_J$ as low as $160\:\rm{μm}$. 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.descriptionChanged content and Corrected typos
dc.identifierhttps://arxiv.org/abs/cond-mat/0604097
dc.identifierhttp://arxiv.org/abs/cond-mat/0604097
dc.identifierAppl. Phys. Lett. 89, 122511 (2006)
dc.identifierdoi:10.1063/1.2356104
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/109610
dc.subjectSuperconductivity
dc.titleHigh quality ferromagnetic 0 and pi Josephson tunnel junctions
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