High performance dc SQUID magnetometers with single layer YBa2Cu3O7−x flux transformers
- 27 December 1993
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 63 (26) , 3630-3632
- https://doi.org/10.1063/1.110071
Abstract
We have fabricated high‐transition temperature superconducting magnetometers involving a flux transformer patterned in a single film of YBa2Cu3O7−x (YBCO) on a 50‐mm‐diam substrate. This transformer is inductively coupled to a loop that in turn is directly coupled to a dc superconducting quantum interference device, patterned in a single layer of YBCO deposited on a SrTiO3 bicrystal. At 77 K, the lowest magnetic field noise achieved is 31 fT Hz−1/2 at frequencies above 5 Hz, increasing to 39 fT Hz−1/2 at 1 Hz.Keywords
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