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Dc SQUID magnetometers from single layers of YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital x]]

Journal Article · · Applied Physics Letters; (United States)
DOI:https://doi.org/10.1063/1.110526· OSTI ID:5920660
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  1. Department of Physics, University of California, Berkeley, California 94720 (United States) Materials Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
We have fabricated magnetometers patterned in a single layer of YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital x]] involving dc superconducting quantum interference devices (SQUIDs) with bicrystalline grain boundary junctions. The magnetometers consist of either a SQUID with a large area square washer or a single turn pickup loop coupled directly to the body of a small area SQUID. We found that the transfer function falls off with increasing SQUID inductance much more rapidly than predicted; implications for magnetometer performance are discussed. When operated at 77 K with a bias reversal technique a directly coupled magnetometer had a noise of (105[plus minus]10) fT Hz[sup [minus]1/2] at 1 kHz, increasing to (145[plus minus]10) fT Hz[sup [minus]1/2] at 1 Hz.
DOE Contract Number:
AC03-76SF00098
OSTI ID:
5920660
Journal Information:
Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 63:16; ISSN APPLAB; ISSN 0003-6951
Country of Publication:
United States
Language:
English