Vortices in Long Josephson Junctions

Abstract

Approved AD-A253 230 4JTATION PAGE0MB No 0704-0188 ( J ,I-.. te h t:ir-tcYn Of 'nirmj)on '.nj ccrm,',s a'r -,q I, -.rt, jrd-.', l C' 1v 't'er spe't Z;1 ! ABSTRACT (Maximum 200 words)This research involved the study of quantized flux lines or vortices in long, Josephson junction structures and in superconductive films in the context ofi: electronic device possibilities suggested by these structures. The work encompassed fabrication and low frequency electrical measurement of thin film device configuration coupled with physical device modeling. This was followed byl! high frequency parameter measurement and creation of circuit models for the' devices.In some cases these circuit models were used to model and optimize i specific circuits such as amplifiers or oscillators and, when warranted, prototypes' were frabicated and tested. The primary structures studied were the long Josephson I junction transistors, including the vortex flow transistor (VFT) and the superCIT., In addition, initial success with an exploratnry device using a single high Tc superconducting film, the SFFT, led to some concentration on circuit realizations,' with this device.Comparisons were made of these three devices which were i fabricated using a variety of thin film superconductors. SUBJECT TERMS NUMBER OF PAGES PRICE CODE SECURITY CLASSIFICATION SECURITY CLASSIFICATIC*" SECURITY CLASSIFICATION LIMITATION OF ABSTRACT OF REPORT OF THIS PAGE OF ABSTRACT UlL (UNLIMITED)NSN 7540-0'-280-5500 Standard Form 298 (Rev 2-89)P-1,cDen by ANfSI 'id Z31.-i