Low noise YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital x]]--SrTiO[sub 3]--YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital x]] multilayers for improved superconducting magnetometers

Journal Article · Sun Jan 15 23:00:00 EST 1995 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.114217· OSTI ID:6599183

Ludwig, F; Koelle, D; Dantsker, E; Nemeth, D T; Miklich, A H; Clarke, J ^[1]; Thomson, R E ^[2]

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1. Department of Physics, University of California, Berkeley, California 94720 (United States) Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
2. National Institute of Standards and Technology, Boulder, Colorado 80303 (United States)

We have fabricated YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital x]]--SrTiO[sub 3]--YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital x]] (YBCO--STO--YBCO) trilayers, in which each layer is patterned photolithographically, capping the first YBCO film with an [ital in] [ital situ] STO film. Atomic force microscopy demonstrates that the capping process dramatically improves the quality of the surface of the second layer, allowing the growth of an upper YBCO film with a substantially reduced level of low-frequency flux noise. A magnetometer with a multiturn flux transformer coupled to a dc superconducting quantum interference device achieved a magnetic field noise of 74 fT Hz[sup [minus]1/2] at 1 Hz, improving to 31 fT Hz[sup [minus]1/2] at 1 kHz.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6599183
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 66:3; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRONIC EQUIPMENT
EQUIPMENT
FABRICATION
FLUXMETERS
HIGH-TC SUPERCONDUCTORS
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
SIGNAL-TO-NOISE RATIO
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES