Thin-film dc SQUID gradiometer using a single YBa2Cu3O7−x layer
- 8 August 1994
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 65 (6) , 779-780
- https://doi.org/10.1063/1.112228
Abstract
A dc SQUID gradiometer with a large effective pickup area using only a single YBa2Cu3O7−x layer and step‐edge Josephson junctions on SrTiO3 substrate has been prepared. The planar gradiometer consists of two loops coupled directly to a small area SQUID in the center of the structure. The main advantage in comparison to magnetometers is the possibility of direct measurements in a magnetically unshielded environment. At 77 K without bias reversal technique we obtain a white noise level of about 4.5×10−5 Φ0 Hz−1/2 or 8×10−13 T cm−1 Hz−1/2 down to 10 Hz. At 1 Hz noise increases up to 6×10−12 T cm−1 Hz−1/2.Keywords
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