Key elements for a sensitive 77 K direct current superconducting quantum interference device magnetometer

L. P. Lee; M. Teepe; V. Vinetskiy; R. Cantor; M. S. Colclough

doi:10.1063/1.114277

Key elements for a sensitive 77 K direct current superconducting quantum interference device magnetometer

L. P. Lee, M. Teepe, V. Vinetskiy, R. Cantor, M. S. Colclough

Conductus, Inc.

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

We have made sensitive dc superconducting quantum interference device (SQUID) magnetometers that operate at 77 K have been made. By using bicrystal grain boundary Josephson junctions and a single layer of YBa₂Cu ₃O₇ thin film with optimized processing and an optimized directly coupled design, we have produced magnetometers with very low noise and a large transfer function. At 77 K, the transfer function is 100 μV/Φ₀; the white field noise of the magnetometer is less than 10 fT/Hz above 10 kHz, rising to 26 fT/Hz at 1 Hz. The corresponding white noise energy has the low value of 2×10^-31 J s; a value very similar to that of commercial Nb SQUIDS. Key elements required to achieve this performance are discussed.

Original language	English
Pages (from-to)	3058
Number of pages	1
Journal	Applied Physics Letters
Volume	66
DOIs	https://doi.org/10.1063/1.114277
State	Published - 1995
Externally published	Yes

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title = "Key elements for a sensitive 77 K direct current superconducting quantum interference device magnetometer",

abstract = "We have made sensitive dc superconducting quantum interference device (SQUID) magnetometers that operate at 77 K have been made. By using bicrystal grain boundary Josephson junctions and a single layer of YBa2Cu 3O7 thin film with optimized processing and an optimized directly coupled design, we have produced magnetometers with very low noise and a large transfer function. At 77 K, the transfer function is 100 μV/Φ0; the white field noise of the magnetometer is less than 10 fT/Hz above 10 kHz, rising to 26 fT/Hz at 1 Hz. The corresponding white noise energy has the low value of 2×10-31 J s; a value very similar to that of commercial Nb SQUIDS. Key elements required to achieve this performance are discussed.",

author = "Lee, \{L. P.\} and M. Teepe and V. Vinetskiy and R. Cantor and Colclough, \{M. S.\}",

year = "1995",

doi = "10.1063/1.114277",

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journal = "Applied Physics Letters",

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T1 - Key elements for a sensitive 77 K direct current superconducting quantum interference device magnetometer

AU - Lee, L. P.

AU - Teepe, M.

AU - Vinetskiy, V.

AU - Cantor, R.

AU - Colclough, M. S.

PY - 1995

Y1 - 1995

N2 - We have made sensitive dc superconducting quantum interference device (SQUID) magnetometers that operate at 77 K have been made. By using bicrystal grain boundary Josephson junctions and a single layer of YBa2Cu 3O7 thin film with optimized processing and an optimized directly coupled design, we have produced magnetometers with very low noise and a large transfer function. At 77 K, the transfer function is 100 μV/Φ0; the white field noise of the magnetometer is less than 10 fT/Hz above 10 kHz, rising to 26 fT/Hz at 1 Hz. The corresponding white noise energy has the low value of 2×10-31 J s; a value very similar to that of commercial Nb SQUIDS. Key elements required to achieve this performance are discussed.

AB - We have made sensitive dc superconducting quantum interference device (SQUID) magnetometers that operate at 77 K have been made. By using bicrystal grain boundary Josephson junctions and a single layer of YBa2Cu 3O7 thin film with optimized processing and an optimized directly coupled design, we have produced magnetometers with very low noise and a large transfer function. At 77 K, the transfer function is 100 μV/Φ0; the white field noise of the magnetometer is less than 10 fT/Hz above 10 kHz, rising to 26 fT/Hz at 1 Hz. The corresponding white noise energy has the low value of 2×10-31 J s; a value very similar to that of commercial Nb SQUIDS. Key elements required to achieve this performance are discussed.

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SN - 0003-6951

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SP - 3058

JO - Applied Physics Letters

JF - Applied Physics Letters

ER -

Key elements for a sensitive 77 K direct current superconducting quantum interference device magnetometer

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