Fig. 1.
Superconductor/insulator Mo/Si superlattice. a Experimental geometry (not to scale). The Mo/Si multilayer is in a magnetic field H applied parallel to the b axis. The transport current I applied along the a axis causes the vortex lattice to move with velocity v across the layers. Electromagnetic radiation from the lattice of flux lines crossing the superconducting layers is picked up by a wire loop antenna. b Transmission electron microscopic image of the Mo/Si multilayer with a multilayer period s = dMo + dSi = 50 Å. The scale bar corresponds to 100 Å. c Optical microscopic image of the bridge etched in the Mo/Si multilayer. The scale bar corresponds to 1 cm