Perpendicular magnetic field dependence of a Josephson current through a Nb/Al-AlO_x/Nb junction

Abstract

Josephson current through a Nb/Al-AlO_x/Nb junction is modulated by the external magnetic field in the direction parallel to the plane of the junction. When two parallel magnetic fields H_x and H_y are applied to the Josephson junction, two Fraunhofer pattern is observed in two direction of H_x and H_y. In this study, we investigated the modulation characteristics of the Josephson current by applying two parallel magnetic fields H_x, H_y and the perpendicular magnetic field H_z. Josephson current was irreversibly modulated by the perpendicular magnetic field H_z.