Influence of ferromagnetic nanoparticles on the critical current of Josephson junction

Abstract Experimental investigation of the current–voltage characteristics of a short Nb/Si 3 N 4 /Nb coplanar Josephson junction with chain of magnetic nanoparticles at T =4.2 K is presented. The array of ferromagnetic Co particles with lateral dimensions of about 100–200 nm have been fabricated by electron lithography. We have shown experimentally that the diffraction pattern of a short Josephson junction with ferromagnetic nanoparticles strongly depends on preliminary magnetization of the particles.