dc SQUID magnetometers from single layers of YBa2Cu3O7−x
- 18 October 1993
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 63 (16) , 2271-2273
- https://doi.org/10.1063/1.110526
Abstract
We have fabricated magnetometers patterned in a single layer of YBa2Cu3O7−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±10) fT Hz−1/2 at 1 kHz, increasing to (145±10) fT Hz−1/2 at 1 Hz.Keywords
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