Ferromagnetic 0-pi Josephson junctions

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dc.creatorWeides, M.
dc.creatorKohlstedt, H.
dc.creatorWaser, R.
dc.creatorKemmler, M.
dc.creatorPfeiffer, J.
dc.creatorKoelle, D.
dc.creatorKleiner, R.
dc.creatorGoldobin, E.
dc.date2007-01-29
dc.date2007-04-27
dc.date.accessioned2026-07-07T08:35:10Z
dc.date.available2026-07-07T08:35:10Z
dc.descriptionWe present a study on low-$T_c$ superconductor-insulator-ferromagnet-superconductor (SIFS) Josephson junctions. SIFS junctions have gained considerable interest in recent years because they show a number of interesting properties for future classical and quantum computing devices. We optimized the fabrication process of these junctions to achieve a homogeneous current transport, ending up with high-quality samples. Depending on the thickness of the ferromagnetic layer and on temperature, the SIFS junctions are in the ground state with a phase drop either 0 or $π$. By using a ferromagnetic layer with variable step-like thickness along the junction, we obtained a so-called 0-$π$ Josephson junction, in which 0 and $π$ ground states compete with each other. At a certain temperature the 0 and $π$ parts of the junction are perfectly symmetric, i.e. the absolute critical current densities are equal. In this case the degenerate ground state corresponds to a vortex of supercurrent circulating clock- or counterclockwise and creating a magnetic flux which carries a fraction of the magnetic flux quantum $Φ_0$.
dc.description5 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0701693
dc.identifierhttp://arxiv.org/abs/cond-mat/0701693
dc.identifierApplied Physics A 89, 613-617 (2007)
dc.identifierdoi:10.1007/s00339-007-4206-3
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/139668
dc.subjectSuperconductivity
dc.titleFerromagnetic 0-pi Josephson junctions
dc.typetext

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