Operation of high-sensitivity radio frequency superconducting quantum interference device magnetometers with superconducting coplanar resonators at 77 K
Creators
- 1. Institut fuer Schicht-und Ionentechnik (ISI), Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany)
Description
We have developed a novel coplanar resonator serving as a tank circuit for radio frequency washer superconducting quantum interference devices (SQUIDs). Two coplanar lines surrounded the circular flux concentrator washer, 13.4 mm in diameter. The SQUID, 3.5 mm in diameter, was coupled to the concentrator in the flip-chip configuration. All parts were fabricated from single-layer epitaxial YBa2Cu3O7 films on LaAlO3 substrates. In this layout, the resonant frequency could be set between 600 and 850 MHz. With SQUID loops of 100x100μm2 (SQUID) inductance Ls=150pH or 10x500μm2 (Ls=260pH), we determined at 77 K white flux noise levels Sφ1/2 of 1.0x10-5 and 1.5x10-5φ0/√(Hz), respectively. Both figures corresponded to the field resolution of about 30 fT/√(Hz). copyright 1997 American Institute of Physics
Additional details
Publishing Information
- Journal Title
- Applied Physics Letters
- Journal Volume
- 71
- Journal Issue
- 5
- Journal Page Range
- p. 704-706.
- ISSN
- 0003-6951
- CODEN
- APPLAB
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 28080807
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- BARIUM COMPOUNDS; BARIUM OXIDES; COPPER OXIDES; FLUX QUANTIZATION; INDUCTANCE; NOISE; SENSITIVITY; SQUID DEVICES; SUPERCONDUCTING CAVITY RESONATORS; YTTRIUM COMPOUNDS; YTTRIUM OXIDES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; CAVITY RESONATORS; CHALCOGENIDES; COPPER COMPOUNDS; ELECTRICAL PROPERTIES; ELECTRONIC EQUIPMENT; EQUIPMENT; FLUXMETERS; MEASURING INSTRUMENTS; MICROWAVE EQUIPMENT; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RESONATORS; SUPERCONDUCTING DEVICES; TRANSITION ELEMENT COMPOUNDS