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Anomalous Supercurrent Modulation in Josephson Junctions With Ni-Based Barriers



Burm Baek, Michael L. Schneider, Matthew R. Pufall, William H. Rippard


We investigate the supercurrent transport characteristics of Ni-barrier Josephson junctions with various barrier multilayer structures. Our device fabrication and magneto-electrical measurement methods provide high enough statistics and rigor necessary for the detailed characterization of magnetic Josephson junctions. As a result, we obtain the oscillatory critical current as a function of Ni thickness that matches the clean-limit transport theory except for certain anomalous features. Salient details include the finite oscillation phase shift due to a nonmagnetic spacer, the near-zero effective magnetic dead layer, and the distorted current-phase relationship near the 0-π transition. These allude to intricacies in the microscopic transport that are unique to certain magnetic Josephson junctions. We discuss a route toward a comprehensive understanding of realistic magnetic Josephson junctions based on the underlying effect of exchange field on the superconducting spin modulation.
IEEE Transactions on Applied Superconductivity


supercurrent transport characteristics, Ni-barrier Josephson junctions, multilayer structures, magneto-electrical measurement methods, oscillatory critical current, Ni thickness, clean-limit transport theory, finite oscillation phase shift, nonmagnetic spacer, magnetic dead layer, microscopic transport, superconducting spin modulation


Baek, B. , Schneider, M. , Pufall, M. and Rippard, W. (2018), Anomalous Supercurrent Modulation in Josephson Junctions With Ni-Based Barriers, IEEE Transactions on Applied Superconductivity, [online], (Accessed April 12, 2024)
Created May 14, 2018, Updated July 8, 2020