Fabrication of high quality ferromagnetic Josephson junctions

Details Fabrication of high quality ferromagnetic Josephson junctions Fabrication of high quality ferromagnetic Josephson junctions

2005-11-22

arxiv.org/abs/cond-mat/0511546v1

Physica C 437-438, 349-352 (2006)

Physics

Condensed Matter

Superconductivity

5 pages, 6 figures; VORTEX IV conference contribution; Submitted to Physica C

Scientific paper

10.1016/j.physc.2005.12.046

We present ferromagnetic Nb/Al2O3/Ni60Cu40/Nb Josephson junctions (SIFS) with an ultrathin Al2O3 tunnel barrier. The junction fabrication was optimized regarding junction insulation and homogeneity of current transport. Using ion-beam-etching and anodic oxidation we defined and insulated the junction mesas. The additional 2 nm thin Cu layer below the ferromagnetic NiCu (SINFS) lowered interface roughness and ensured very homogeneous current transport. A high yield of junctional devices with jc spreads less than 2% was obtained.

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