Multilevel YBaCuO flux transformers with high T sub c SQUIDs: A prototype high T sub c SQUID magnetometer working at 77 K

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.105549· OSTI ID:5551006

Oh, B; Koch, R H; Gallagher, W J; Robertazzi, R P; Eidelloth, W ^[1]

---

1. IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598 (US)

We have constructed optimized high {ital T}{sub {ital c}} YBa{sub 2}Cu{sub 3}O{sub 7} (YBCO) multiturn flux transformers using laser-deposited films patterned with ion milling and only photolithographic masking. A five-turn flux transformer with a 0.5{times}0.5 mm{sup 2} pickup loop was coupled to a YBCO superconducting quantum interference device (SQUID) made on a separate substrate to demonstrate a prototype high {ital T}{sub {ital c}} SQUID magnetometer with all components working at 77 K. There was no additional noise associated with the input coil and transformer. The magnetic field sensitivity of the 0.5{times}0.5 mm{sup 2} magnetometer was 3.8 pT/{radical}Hz at 77 K and 1 kHz.

• OSTI ID: 5551006
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 59:1; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

426001* -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRONIC EQUIPMENT
EQUIPMENT
FABRICATION
FLUXGATE MAGNETOMETERS
FLUXMETERS
HIGH-TC SUPERCONDUCTORS
LOW TEMPERATURE
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
OPERATION
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
QUATERNARY COMPOUNDS
SIGNAL-TO-NOISE RATIO
SQUID DEVICES
SUPERCONDUCTING COILS
SUPERCONDUCTING DEVICES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
USES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES