Width of the 0−π phase transition in diffusive magnetic Josephson junctions

Zahra Shomali; Malek Zareyan; Wolfgang Belzig

doi:10.1103/PhysRevB.78.214518

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Width of the 0−π phase transition in diffusive magnetic Josephson junctions

Zahra Shomali, Malek Zareyan, Wolfgang Belzig

DOI 10.1103/PhysRevB.78.214518 · Physical Review B

T1

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Abstract

We investigate the Josephson current between two superconductors (S) which are connected through a diffusive magnetic junction with a complex structure (Fc). Using the quantum circuit theory, we obtain the phase diagram of 0 and π Josephson couplings for Fc being an insulator-ferromagnet-insulator (IFI) double barrier junction or an IFNFI structure (where N indicates a normal-metal layer). Compared to a simple SFS structure, we find that the width of the transition, defined by the interval of exchange fields in which a 0−π transition is possible, is increased by insulating barriers at the interfaces and also by the presence of the additional N layer. The widest transition is found for symmetric Fc structures. The symmetric SIFNFIS presents the most favorable condition to detect the temperature-induced 0−π transition with a relative width, which is five times larger than that of the corresponding simple SFS structure.

Source-reported materials — not catalogue approval

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