TY - JOUR

T1 - Josephson effect in SIFS tunnel junctions with domain walls in the weak link region

AU - Bakurskiy, S.V.

AU - Golubov, Alexandre Avraamovitch

AU - Klenov, N.V.

AU - Kupriyanov, M..Y.

AU - Soloviev, I.I.

PY - 2015

Y1 - 2015

N2 - We study theoretically the properties of SIFS type Josephson junctions composed of two superconducting (S) electrodes separated by an insulating layer (I) and a ferromagnetic (F) film consisting of periodic magnetic domains structure with antiparallel magnetization directions in neighboring domains. The two-dimensional problem in the weak link area is solved analytically in the framework of the linearized quasiclassical Usadel equations. Based on this solution, the spatial distributions of the critical current density, J C , in the domains and critical current, I C , of SIFS structures are calculated as a function of domain wall parameters, as well as the thickness, d F , and the width, W, of the domains. We demonstrate that I C (d F , W) dependencies exhibit damped oscillations with the ratio of the decay length, ξ1, and oscillation period, ξ2, being a function of the parameters of the domains, and this ratio may take any value from zero to unity. Thus, we propose a new phys-ical mechanism that may explain the essential difference between ξ1 and ξ2 observed experimentally in various types of SFS Josephson junctions.

AB - We study theoretically the properties of SIFS type Josephson junctions composed of two superconducting (S) electrodes separated by an insulating layer (I) and a ferromagnetic (F) film consisting of periodic magnetic domains structure with antiparallel magnetization directions in neighboring domains. The two-dimensional problem in the weak link area is solved analytically in the framework of the linearized quasiclassical Usadel equations. Based on this solution, the spatial distributions of the critical current density, J C , in the domains and critical current, I C , of SIFS structures are calculated as a function of domain wall parameters, as well as the thickness, d F , and the width, W, of the domains. We demonstrate that I C (d F , W) dependencies exhibit damped oscillations with the ratio of the decay length, ξ1, and oscillation period, ξ2, being a function of the parameters of the domains, and this ratio may take any value from zero to unity. Thus, we propose a new phys-ical mechanism that may explain the essential difference between ξ1 and ξ2 observed experimentally in various types of SFS Josephson junctions.

KW - METIS-313879

KW - IR-98757

U2 - 10.1134/S0021364015110041

DO - 10.1134/S0021364015110041

M3 - Article

VL - 101

SP - 765

EP - 771

JO - JETP letters

JF - JETP letters

SN - 0021-3640

IS - 11

ER -