Abstract: During the manufacture of Josephson superconducting devices, it is necessary to provide on a substrate a base electrode, a counter electrode and a small tunnel barrier area therebetween. A novel method of making all three of these active elements in the same vacuum chamber without having to remove the substrate from the vacuum chamber is provided so that the tunnel barrier area is accurately made to a predetermined size and without the danger of contamination. The novel structure is made as a substantially planarized laminate in the vacuum chamber and the tunnel barrier area is defined in a supplemental step.

Abstract: A block replicate bubble memory device is provided with a plurality of series storage loops, wherein data words are written into or read out of the storage loops in parallel. The data is entered into write lines and is read on to read lines which are connected to the series storage loops approximately one-half of one loop time apart. Information in the storage loops is ordinarily changed or altered in no less than one-half of one loop time in the prior art. The present invention provides a plurality of bubble generators connected to the serial write line in a manner which permits several bubble device functions to be conducted in less than one-half of one loop time.