Sensitive YBa sub 2 Cu sub 3 O sub 7 minus x thin-film magnetometer
- Department of Physics, University of California, Berkeley, and Center for Advanced Materials, Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, CA (USA)
- Conductus, Inc., 969 West Maude Avenue, Sunnyvale, CA (USA)
Our YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} thin-film magnetometer consists of a dc superconducting quantum interference device with bi-epitaxial Josephson junctions, fabricated on one chip, and a flux transformer with a multiturn input coil, fabricated on a second chip. Photolithographic processing is used to pattern all layers. The magnetometer operates in a flux-locked loop at temperatures up to 81 K, with the flux transformer improving the magnetic field sensitivity by a factor of 83{plus minus}3. The low-frequency rms magnetic field noise scales approximately as 1/{ital f}{sup 1/2}, where {ital f} is the frequency, with a magnitude of 0.6 pT Hz{sup {minus}1/2} at 10 Hz and 0.09 pT Hz{sup {minus}1/2} at 1 kHz with the magnetometer immersed in liquid N{sub 2}.
- OSTI ID:
- 5338121
- Journal Information:
- Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 59:8; ISSN APPLA; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRONIC EQUIPMENT
EQUIPMENT
FABRICATION
FILMS
FLUXMETERS
HIGH-TC SUPERCONDUCTORS
JOSEPHSON EFFECT
MAGNETIC FLUX
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES