ИСТИНА

We calculate the critical current density Jc of FJJs containing ferromagnetic, normal, and insulating layers in the weak link region. We determine the Green's functions with the help of the Usadel equations, which we use in theta parametrization. The Kupriyanov-Lukichev boundary conditions at all interfaces were used. It is shown that even a thin additional N layer may change the boundary conditions at the IF boundary depending on the value of its conductivity. We conclude that it effectively mitigates the effect of the insulating barrier on the decaying oscillations of the critical current density Jc(dF). Even technological thin N layers, which almost do not suppress the superconducting correlation, have to be taken into account for the explanation of experimental results concerning the Josephson effect in FJJs. For example, the 0 and π states of multilayered FJJs containing few normal layers, proposed recently as basis for a cryogenic magnetic memory, should be determined very carefully.