Nb-PtNi-Nb Josephson junctions made by 3D FIB nano-sculpturing
2009 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 150, no 5, 052062- p.Article in journal (Refereed) Published
We use Focused Ion Beam (FIB) for fabrication of nano-scale Superconductor-Ferromagnet-Superconductor (SFS) Josephson junctions, aiming to achieve a uniform, mono-domain state in the F-layer within the junction. We employ a Pt1-xNix alloy, characterized by the perfect solubility of the two components, for obtaining a homogeneous diluted ferromagnet. We perform a systematic analysis of both chemical composition, and ferromagnetic properties of Pt1—xNix thin films for different Ni—concentrations. The nano-scale homogeneity of the Pt1—xNix films is confirmed by energy dispersive X-ray spectroscopy. The Curie temperature of Pt1—xNix films decreases in a non-linear manner with Ni concentration. We observe that the critical current density of Nb — Pt1—xNix — Nb junctions decreases non-monotonously with increasing Ni-concentration: at x 30% it exhibits a minimum, which we attribute to switching into the π state as a function of Ni-concentration.
Place, publisher, year, edition, pages
2009. Vol. 150, no 5, 052062- p.
Condensed Matter Physics
Research subject Physics
IdentifiersURN: urn:nbn:se:su:diva-56627DOI: 10.1088/1742-6596/150/5/052062OAI: oai:DiVA.org:su-56627DiVA: diva2:411873