Asymmetric YBaCuO interferometers and SQUIDs made with focused electron-beam irradiation junctions

Author

Moore, D.F. ; Pauza, A.J. ; Booij, W.E. ; Blamire, M.G. ; Herrmann, K. ; Baudenbacher, F. ; Harnisch, T. ; Walker, J.F. ; Cade, N. ; Jedamzik, D.

Author_Institution

Interdisciplinary Res. Centre in Superconductivity, Cambridge Univ., UK

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

2494

Lastpage

2497

Abstract

We report the fabrication and testing of compact interferometers operating at temperatures up to 60-80 K. Focused electron-beam irradiation Josephson junctions are made in YBaCuO, and a focused ion beam is used for precise etching of the tracks of superconductor. The SQUID characteristics and the properties of coupled superconducting loops are promising for applications such as comparators for analog/digital converters. Focused ion beam trimming of circuit elements is particularly useful for prototyping devices and for defining the small inductors required in circuits for high temperature operation.

Keywords

Josephson effect; SQUIDs; analogue-digital conversion; barium compounds; critical currents; current comparators; electron beam applications; focused ion beam technology; high-temperature superconductors; sputter etching; superconducting device testing; yttrium compounds; 60 to 80 K; Josephson junctions; SQUIDs; YBaCuO; analog/digital converters; asymmetric YBaCuO interferometers; compact interferometers; comparators; coupled superconducting loops; critical current; device prototyping; fabrication; focused electron-beam irradiation junctions; focused ion beam; focused ion beam trimming; high temperature operation; precise etching; small inductors; superconductor tracks; testing; Circuits; Etching; Fabrication; High temperature superconductors; Interferometers; Ion beams; Josephson junctions; SQUIDs; Testing; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.621745

Filename

621745