Magnetic study of double layered NbN-Nb microstrip line

We propose a complex potential method allowing the magnetic characterization of multisupraconductor transmission lines. We apply it to the case of double layered strips. With the use of a moment method (matching point technique), we compute the current density distributions, the inductance and the effective London penetration depth λefffor a NbN-Nb double layered film. The results show an importantt decrease of the inductance when the thickness of the Nb layer is reduced. Experimental and theoretical results are compared.