Study of DyBaCuO DC SQUIDs for low noise and high flux focusing

Author

Higashino, Y. ; Umezawa, T.

Author_Institution

TERATEC Corp., Tokyo, Japan

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

2497

Lastpage

2500

Abstract

We have fabricated DyBaCuO DC SQUIDs by MBE growth on MgO substrates containing 45/spl deg/ step-edge Josephson junctions. They showed RSJ-like current-voltage characteristics and periodic modulation of voltage aroused by an applied magnetic field at 77 K. The flux resolution of the 1.9 mm square washer SQUID was measured to 3/spl times/10/sup -4/ /spl Phi//sub 0//Hz/sup 1/2/ at 1 Hz, which corresponds to a magnetic field sensitivity of 14 pT/Hz/sup 1/2/. Effective flux capture areas were investigated for varying SQUID size of washer and hole.<>

Keywords

SQUIDs; barium compounds; dysprosium compounds; focusing; high-temperature superconductors; molecular beam epitaxial growth; superconducting device noise; 1 Hz; 1.9 mm; 77 K; DC SQUIDs; DyBaCuO; MBE growth; MgO; MgO substrates; RSJ-like current-voltage characteristics; flux capture areas; flux resolution; low noise high flux focusing; magnetic field sensitivity; step-edge Josephson junctions; washer; Etching; Fabrication; Josephson junctions; Magnetic field measurement; Magnetic flux; Molecular beam epitaxial growth; Resists; SQUIDs; Substrates; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403076

Filename

403076