Planar SFS Josephson Junctions Made by Focused Ion Beam Etching

Details Planar SFS Josephson Junctions Made by Focused Ion Beam Etching Planar SFS Josephson Junctions Made by Focused Ion Beam Etching

2004-11-05

arxiv.org/abs/cond-mat/0411152v1

Physica C 418 (2005) 16

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures, presentation at EUCAS-2003, to be published in Physica C

Scientific paper

10.1016/j.physc.2004.11.004

Superconductor-Ferromagnet-Superconductor (S-F-S) Josephson junctions were fabricated by making a narrow cut through a S-F double layer using direct writing by Focused Ion Beam (FIB). Due to a high resolution (spot size smaller than 10 nm) of FIB, junctions with a small separation between superconducting electrodes ($\leq$ 30 nm) can be made. Such a short distance is sufficient for achieving a considerable proximity coupling through a diluted CuNi ferromagnet. We have successfully fabricated and studied S-F-S (Nb-CuNi-Nb) and S-S'-S (Nb-Nb/CuNi-Nb) junctions. Junctions exhibit clear Fraunhofer modulation of the critical current as a function of magnetic field, indicating good uniformity of the cut. By changing the depth of the cut, junctions with the $I_c R_n$ product ranging from 0.5 mV to $\sim 1\mu $V were fabricated.

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