Critical Current Suppression in Spin-Filter Josephson Junctions

Coexistence and tuning of spin-singlet and triplet transport in spin-filter Josephson junctions

“…In parallel with the work on diffusive ferromagnets, superconducting tunnel junctions with ferromagnetic insulator (FI) barriers, namely spin-filter JJs NbN/GdN/NbN, have revealed unique transport properties, such as spin-polarization phenomena [26][27][28][29], an interfacial exchange field in the superconducting layer [30,31], macroscopic quantum tunneling [32] and an unconventional incipient 0-π transition [33]. They are especially well-suited for the implementation in superconducting circuits in which a very low dissipation is required [34][35][36][37][38][39][40].…”

Coexistence and tuning of spin-singlet and triplet transport in spin-filter Josephson junctions

“…In our model, this implies dealing with systems of few lattice sites, hence, we choose L = 8 and keep it fixed in all the numerical simulations, in agreement with the short-junction limit. However, the main effect of increasing the experimental sample thickness (and so the magnetic area of the FI) consists in enhancing the magnetic activity of the junction 28,30,31,35 . In our model, we manage to mimic this effect by changing the flux of the exchange field Φ(h) = LWh through the JJ (by the means of the width of the barrier W) and by tuning the impurity potential strength V imp (thus, changing the influence of disorder effects in the system).…”

“…In parallel with the work on diffusive ferromagnets, superconducting tunnel junctions with ferromagnetic insulator (FI) barriers (SFIS), namely spin-filter NbN/GdN/NbN JJs, have revealed unique transport properties, such as spin-polarization phenomena [28][29][30][31] , an interfacial exchange field in the superconducting layer 32,33 , macroscopic quantum tunneling 34 and an unconventional incipient 0-π transition 35 . They are especially well-suited for the implementation in superconducting circuits in which a very low dissipation is required [36][37][38][39][40][41][42] .…”