NDLI: Integrated multilayer high-T/sub c/ SQUID magnetometers with slotted washer

Content Provider	IEEE Xplore Digital Library
Author	Lee, H.J. Park, W.K. Lee, S.-M. Park, J.D. Moon, S.H. Oh, B.
Copyright Year	2002
Abstract	We have fabricated and characterized multilayer high-T/sub c/ SQUID magnetometers designed for a magnetically unshielded environment. The magnetometers consist of YBa/sub 2/Cu/sub 3/O/sub 7-x/(YBCO)/SrTiO/sub 3/(STO)/YBCO trilayers deposited by pulsed laser deposition (PLD) on an STO bi-crystal substrate. We fabricated SQUIDs with slotted washers at the bottom or top YBCO layer. The slots consist of 4 /spl mu/m wide superconducting lines separated by 8 /spl mu/m. A flux transformer with a multi-turn input coil was defined on the top or bottom YBCO layer, and the SQUID washer was used as a crossover pattern to simplify the fabrication process. The pickup loop size was 4 mm/spl times/7 mm, and the magnetometer effective area was found to be 0.67 mm/sup 2/. The SQUID inductance was 85 pH. For the operation of our SQUID in unshielded environments, compact 3 MHz modulation flux locked loop (FLL) electronics with bias-reversal were developed. The system bandwidth was greater than 500 kHz, and maximum slew rate was about 10/sup 6/ /spl Phi//sub 0//sec. The flux noise spectra of the magnetometers were measured and compared with our single layer devices. We also investigated the effect of slots on the coupling strength between the input coil and SQUID.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1327
Ending Page	1330
Page Count	4
File Size	542547
File Format	PDF
ISSN	10518223
Volume Number	11
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Nonhomogeneous media SQUID magnetometers Yttrium barium copper oxide Magnetic multilayers Pulsed laser deposition Superconducting coils Magnetic separation Magnetic flux Superconducting magnets Optical pulses
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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