High- Tc thin-film magnetometer

Conference · Sat Sep 01 00:00:00 EDT 1990

OSTI ID:5771963

Miklich, A H; Wellstood, F C; Kingston, J J; Clarke, J ^[1]; Colclough, M S ^[2]; Cardona, A H; Bourne, L C; Olson, W L; Eddy, M M ^[3]

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1. Lawrence Berkeley Lab., CA (USA)
2. Conductus, Inc., Sunnyvale, CA (USA)
3. Superconductor Technologies, Inc., Santa Barbara, CA (USA)

We have constructed and tested high-{Tc} magnetometers by coupling a high-{Tc} thin-film Superconducting QUantum Interference Device (SQUID) to two different high-{Tc} thin-film flux transformers. The SQUID was made from Tl{sub 2}CaBa{sub 2}Cu{sub 2}O{sub 8+y} films grown on MgO, with junctions consisting of native grain boundaries. The flux transformers were made from YBa{sub 2}Cu{sub 3}O{sub 7-x}, and each had 10-turn input coils and a single-turn pickup loop. The first transformer, which was patterned with a combination of shadow masks and photolithography, yielded a magnetic field gain of about {minus}7.5, functioned up to 79 K, and gave a magnetic field sensitivity B{sub N} (10 Hz) {approx} 3.1 pT Hz{sup {minus}1/2}at 38 K. The second transformer, which was patterned entirely by photolithography, yielded a gain of about {minus}8.7, functioned up to 25 K, and had a sensitivity B{sub N} (10 Hz) {approx} 3.5 pT Hz{sup {minus}1/2} at 4.2 K. In both cases, the limiting noise arose in the SQUID. 10 refs., 5 figs., 1 tab.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5771963
• Report Number(s): LBL-28892; CONF-900944-42; ON: DE91011828
• Resource Relation: Conference: Applied superconductivity conference, Aspen, CO (USA), 24-28 Sep 1990
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
MAGNETIC FIELDS
SENSITIVITY
MAGNETOMETERS
CONSTRUCTION
SQUID DEVICES
JOINING
TRANSFORMERS
BARIUM COMPOUNDS
COPPER OXIDES
EXPERIMENTAL DATA
FLUXGATE MAGNETOMETERS
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
LOW TEMPERATURE
MAGNESIUM OXIDES
NOISE
TESTING
THIN FILMS
YTTRIUM BASE ALLOYS
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL STRUCTURE
DATA
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
FABRICATION
FILMS
FLUXMETERS
INFORMATION
MAGNESIUM COMPOUNDS
MEASURING INSTRUMENTS
MICROSTRUCTURE
MICROWAVE EQUIPMENT
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTING DEVICES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM ALLOYS
426001* - Engineering- Superconducting Devices & Circuits- (1990-)