Abstract
Novel superconducting weak links, ‘π‐junctions’, were realized recently. An origin of the π‐state in a Superconductor ‐ Ferromagnet ‐ Superconductor (SFS) junction is an oscillating and sign‐reversing superconducting order parameter induced in the ferromagnet close to the SF‐interface. The π‐behavior in SFS sandwiches was first observed by our group in 2000. Our recent result was a detection of transitions into π‐state and back into 0‐state, i.e. a nonmonotonic (with two nodes) behavior of the junction critical current vs. F‐layer thickness, π‐junctions with critical current density up to 2000 A/cm2 were achieved that are suitable for applications in future superconducting digital and quantum electronics. Our junctions are based on a niobium thin film technology so they can be incorporated directly into existing architectures of the superconducting electronics.
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