Direct-coupled high T/sub c/ DC SQUID gradiometer with single layer YBa/sub 2/Cu/sub 3/O/sub 7

We have studied first derivative high T/sub c/ dc SQUID (Superconducting QUantum Interference Device) gradiometer from a single layer of Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7/ thin film using pulsed laser deposition (PLD) and argon ion beam etching method. The planar gradiometer consists of two pickup l...

Full description

Saved in:
Bibliographic Details
Published inIEEE transactions on applied superconductivity Vol. 7; no. 2; pp. 3228 - 3230
Main Authors Yunsung Huh, Soon-Gul Lee, In-Seon Kim, Yong Ho Lee, Hyuk Chan Kwon, Yong Ki Park, Jong-Chul Park, Insang Song, Gwangseo Park
Format Journal Article
LanguageEnglish
Published IEEE 01.06.1997
Subjects
Argon
Interference
Optical pulses
Pulsed laser deposition
Sputtering
SQUIDs
Superconducting devices
Superconducting epitaxial layers
Superconducting thin films
Thin film devices
Online AccessGet full text

Cover

More Information
Summary:We have studied first derivative high T/sub c/ dc SQUID (Superconducting QUantum Interference Device) gradiometer from a single layer of Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7/ thin film using pulsed laser deposition (PLD) and argon ion beam etching method. The planar gradiometer consists of two pickup loops coupled directly to dc SQUID with an inductance of about 20 pH in the center of the structure. The gradiometer contains step-edge type junctions of 3 /spl mu/m width and is made on the SrTiO/sub 3/ substrate of 12/spl times/25 mm/sup 2/ in size. The SQUID showed RSJ type junction I-V characteristics with T/sub c/ of 86 K and swing voltage of /spl sim/4 /spl mu/V at 79.3 K. The magnetometer was sensitive only to the gradient of the magnetic field with well balanced null response to uniform fields.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.622034