Fabrication and characterization of short Josephson junctions with stepped ferromagnetic barrier

Peralagu, U. and Weides, M. (2008) Fabrication and characterization of short Josephson junctions with stepped ferromagnetic barrier. Superconductivity News Forum, 3(ST27), pp. 1-6.

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Abstract

We present novel low-T_c superconductor-insulator-ferromagnet-superconductor (SIFS) Josephson junctions with planar and stepped ferromagnetic interlayer. We optimized the fabrication process to set a step in the ferromagnetic layer thickness. Depending on the thickness of the ferromagnetic layer the ground state of the SIFS junction has a phase drop of either 0 or pi. So-called 0-pi Josephson junctions, in which 0 and pi ground states compete with each other, were obtained. These stepped junctions may have a double degenerate ground state, corresponding to a vortex of supercurrent circulating clock- or counterclockwise and creating a magnetic flux which carries a fraction of the magnetic flux quantum \Phi_0. Here, we limit the presentation to static properties of short junctions.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Peralagu, Mr Uthayasankaran
Authors: Peralagu, U., and Weides, M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Superconductivity News Forum
ISSN:0897-2427
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