Magnetic imaging of YBa2Cu3O y sampler circuits with moats by a scanning SQUID microscope
Creators
- 1. Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Koto-Ku, Tokyo 135-0062 (Japan) and Japan Society for the Promotion of Science, 6 Ichibancho, Chiyoda-Ku, Tokyo 102-8471 (Japan)
- 2. Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Koto-Ku, Tokyo 135-0062 (Japan)
Description
We have investigated the flux state in YBa2Cu3O y (YBCO) sampler circuits having superconducting ground planes with 5 or 7-μm-wide moats by a scanning SQUID microscope (SSM) system. It was found that magnetic flux was trapped into continuous moats with the length larger than 20 μm, and magnetic flux was excluded from the moat-surrounded area which includes ramp-edge Josephson junctions and ground plane contacts. We ensured that flux trapping into ground plane contacts is suppressed by reducing its size to typically 5 x 5 μm2. The threshold value for complete flux exclusion is about 0.8 μT slightly depending on chips, which can be readily achieved with dual μ-metal magnetic shielding. In addition, we have observed the magnetic flux due to electric noise which comes from outside the SSM chamber
Additional details
Identifiers
- DOI
- 10.1016/j.physc.2005.02.129;
- PII
- S0921-4534(05)00530-7;
Publishing Information
- Journal Title
- Physica. C, Superconductivity
- Journal Volume
- 426-431
- Journal Page Range
- p. 1668-1673
- ISSN
- 0921-4534
- CODEN
- PHYCE6
Conference
- Title
- 17. International symposium on superconductivity - Advances in superconductivity XVII
- Acronym
- ISS 2004
- Dates
- 23-25 Nov 2004
- Place
- Niigata (Japan)
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 37112184
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- BARIUM COMPOUNDS; CUPRATES; HIGH-TC SUPERCONDUCTORS; JOSEPHSON JUNCTIONS; MAGNETIC FLUX; MAGNETIC SHIELDING; NOISE; SAMPLERS; SQUID DEVICES; TRAPPING; YTTRIUM COMPOUNDS
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; COPPER COMPOUNDS; ELECTRONIC EQUIPMENT; EQUIPMENT; FLUXMETERS; MEASURING INSTRUMENTS; MICROWAVE EQUIPMENT; OXYGEN COMPOUNDS; SHIELDING; SUPERCONDUCTING DEVICES; SUPERCONDUCTING JUNCTIONS; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; TYPE-II SUPERCONDUCTORS
Optional Information
- Copyright
- Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.