NbN-Based Ferromagnetic 0 and π Josephson Junctions

Taro Yamashita; Akira Kawakami; Hirotaka Terai

doi:10.1103/PhysRevApplied.8.054028

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NbN-Based Ferromagnetic 0 and π Josephson Junctions

Taro Yamashita, Akira Kawakami, Hirotaka Terai

DOI 10.1103/PhysRevApplied.8.054028 · Physical Review Applied

T1

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Abstract

We report the development of niobium nitride (NbN)-based ferromagnetic π Josephson junctions. For fabricated NbN/copper−nickel (CuNi)/NbN junctions, we measure the ferromagnetic CuNi thickness and temperature dependences of the Josephson critical current and find the cusp structure indicating the transition between the 0 and π states. We also observe the characteristic temperature dependences for the junctions with CuNi thicknesses near the 0−π transition thickness, which originate from the interplay between superconductivity and magnetism. The experimental results are consistently explained by the microscopic theory with reasonable physical parameters. The developed NbN-based π junctions are compatible with and provide advantages for superconducting logic circuits and/or quantum computers based on nitride superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.1	Pressure not reported	onset