Role of normal layer in ferromagnetic Josephson junctions
Using the Usadel equation approach, we have calculated the critical current density in ferromagnetic (F) Josephson junctions of
different types containing insulating (I) and normal metal (N) layers in the weak link region. Even a thin additional N layer may
change the boundary conditions at the SF or IF interface, where S is a superconducting electrode. We show that inserting an N
layer may increase the critical current density Jc and shift the 0- transition to larger or smaller values of the thickness dF of the
ferromagnet, depending on the boundary parameters.