0-pi Josephson tunnel junctions with ferromagnetic barrier

Details 0-pi Josephson tunnel junctions with ferromagnetic barrier 0-pi Josephson tunnel junctions with ferromagnetic barrier

2006-05-26

arxiv.org/abs/cond-mat/0605656v3

Phys. Rev. Lett. 97, 247001 (2006)

Physics

Condensed Matter

Superconductivity

submitted to PRL

Scientific paper

10.1103/PhysRevLett.97.247001

We fabricated high quality Nb/Al_2O_3/Ni_{0.6}Cu_{0.4}/Nb superconductor-insulator-ferromagnet-superconductor Josephson tunnel junctions. Using a ferromagnetic layer with a step-like thickness, we obtain a 0-pi junction, with equal lengths and critical currents of 0 and pi parts. The ground state of our 330 microns (1.3 lambda_J) long junction corresponds to a spontaneous vortex of supercurrent pinned at the 0-pi step and carrying ~6.7% of the magnetic flux quantum Phi_0. The dependence of the critical current on the applied magnetic field shows a clear minimum in the vicinity of zero field.

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