Sensitive high-T/sub c/ SQUID magnetometers for unshielded operation
| Autor: | S. Yoshizumi, Roger H. Koch, K.-Y. Yang, H.S. Trammell, F. P. Milliken, James R. Rozen, M.S. Dilorio, D.K. Lathrop, D. Haran, Shwetank Kumar, S. G. Haupt |
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| Rok vydání: | 1999 |
| Předmět: |
High-temperature superconductivity
Materials science Magnetometer business.industry Flux Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Magnetic field SQUID Nuclear magnetic resonance Earth's magnetic field Optics law Pickup Electrical and Electronic Engineering business Sensitivity (electronics) |
| Zdroj: | IEEE Transactions on Appiled Superconductivity. 9:4428-4431 |
| ISSN: | 1051-8223 |
| DOI: | 10.1109/77.784007 |
| Popis: | We have developed sensitive highly reliable high-T/sub c/ SQUID magnetometers a reproducible SNS junction fabrication process. In order to enable unshielded operation in the earth's field, we have incorporated flux dams into direct-coupled SQUID magnetometers. By using up to four pickup coils in parallel, each with its own flux dam, an effective area of 0.57 mm/sup 2/ has been achieved on 24 mm/spl times/24 mm substrates using 100 /spl mu/m wide pickup coils. We have demonstrated a magnetic field noise sensitivity of 80 fT//spl radic/Hz 10 Hz and 77 K in an externally applied field 60 /spl mu/T. This magnetic field sensitivity unchanged from the zero-field measurement. |
| Databáze: | OpenAIRE |
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