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Nb-PtNi-Nb Josephson Junctions Made by 3D FIB Nano-Sculpturing

Henrik Frederiksen (Institutionen för mikroteknologi och nanovetenskap, Nanotekniklaboratoriet)
Journal of Physics: Conference Series Vol. 150 (2009) (2009), 052062,
[Konferensbidrag, övrigt]

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.



Denna post skapades 2010-01-15.
CPL Pubid: 107853

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Nanotekniklaboratoriet

Ämnesområden

Lågtemperaturfysik

Chalmers infrastruktur