Low-noise YBa2Cu3O7 -PrBa2Cu3O7 multiturn flux transformers
- 17 January 1994
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 64 (3) , 366-368
- https://doi.org/10.1063/1.111149
Abstract
Epitaxial thin‐film YBa2Cu3O7 flux transformers with multiturn input coils have been constructed on 1 cm2 MgO substrates using PrBa2Cu3O7 as an insulator. By coupling these to high‐temperature superconducting quantum interference devices (SQUIDs) using a flip‐chip technology, several low‐noise magnetometers and a gradiometer have been constructed. The yield of fully working flux transformers on 1 cm2 substrates exceeds 80%, and field sensitivities at 77 K of (520±30)fT/√Hz at 1 Hz and (165±8)fT/√Hz above 10 Hz have been achieved. No evidence for excess low‐frequency noise above that of the uncoupled SQUID has been found in the flip‐chip magnetometers.Keywords
This publication has 11 references indexed in Scilit:
- Sensitive RF-SQUIDs and magnetometers operating at 77 KIEEE Transactions on Applied Superconductivity, 1993
- Bicrystal YBCO DC SQUIDs with low noiseIEEE Transactions on Applied Superconductivity, 1993
- Thin film HTc SQUID construction and characterisationIEEE Transactions on Applied Superconductivity, 1993
- Design of multiloop input circuits for high-T c superconducting quantum interference magnetometersJournal of Applied Physics, 1992
- End point detection in ion beam milling of YBa2Cu3O7 thin filmsApplied Physics Letters, 1992
- Monolithic 77 K dc SQUID magnetometerApplied Physics Letters, 1991
- Sensitive YBa2Cu3O7−x thin-film magnetometerApplied Physics Letters, 1991
- Multilevel YBaCuO flux transformers with high T c SQUIDs: A prototype high T c SQUID magnetometer working at 77 KApplied Physics Letters, 1991
- Effect of small changes in composition on the electrical and structural properties of YBa2Cu3O7 thin filmsApplied Physics Letters, 1990
- Coupling considerations for SQUID devicesJournal of Applied Physics, 1975