0−π Josephson Tunnel Junctions with Ferromagnetic Barrier
M. Weides, M. Kemmler, H. Kohlstedt, R. Waser, D. Koelle, R. Kleiner, E. Goldobin
DOI 10.1103/PhysRevLett.97.247001 · Physical Review Letters
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Abstract
We fabricated high quality Nb/Al2O3/Ni0.6Cu0.4/Nb superconductor-insulator-ferromagnet-superconductor Josephson tunnel junctions. Using a ferromagnetic layer with a steplike thickness, we obtain a 0−π junction, with equal lengths and critical currents of 0 and π parts. The ground state of our 330 μm (1.3λJ) long junction corresponds to a spontaneous vortex of supercurrent pinned at the 0−π step and carrying ∼6.7% of the magnetic flux quantum Φ0. The dependence of the critical current on the applied magnetic field shows a clear minimum in the vicinity of zero field.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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