Low-Noise, Single-Layer YBa2Cu3O7.x DC SQUID Magnetometers at 77 K

Robin Cantor; Luke P. Lee; Mark Teepe; Vladimir Vinetskiy; Joseph Longo

doi:10.1109/77.403205

Low-Noise, Single-Layer YBa2Cu3O7.x DC SQUID Magnetometers at 77 K

Robin Cantor
, Luke P. Lee
, Mark Teepe
, Vladimir Vinetskiy
, Joseph Longo

Conductus, Inc.

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

55 Scopus citations

Abstract

We describe a low-noise dc Superconducting QUantum Interference Device (SQUID) magnetometer that is fabricated from a single layer of YBa2Cu3O7-x on a 2 cm x 2 cm bicrystal substrate. The magnetometer design consists of a single-turn pickup loop that is directly coupled to a low inductance SQUID. Using conventional flux-locked loop electronics with bias current reversal, the white flux noise of several of these magnetometers operated at 77 K is observed to be as low as 2.2 above 10 kHz, increasing to about 5.7 at 1 Hz. The field-to-flux conversion efficiency is measured to be 4.6 nT/Φo, resulting in a white magnetic field noise of 10 fT/ above 10 kHz, increasing to 26 at 1 Hz.

Original language	English
Pages (from-to)	2927-2930
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	5
Issue number	2
DOIs	https://doi.org/10.1109/77.403205
State	Published - Jun 1995
Externally published	Yes

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title = "Low-Noise, Single-Layer YBa2Cu3O7.x DC SQUID Magnetometers at 77 K",

abstract = "We describe a low-noise dc Superconducting QUantum Interference Device (SQUID) magnetometer that is fabricated from a single layer of YBa2Cu3O7-x on a 2 cm x 2 cm bicrystal substrate. The magnetometer design consists of a single-turn pickup loop that is directly coupled to a low inductance SQUID. Using conventional flux-locked loop electronics with bias current reversal, the white flux noise of several of these magnetometers operated at 77 K is observed to be as low as 2.2 above 10 kHz, increasing to about 5.7 at 1 Hz. The field-to-flux conversion efficiency is measured to be 4.6 nT/Φo, resulting in a white magnetic field noise of 10 fT/ above 10 kHz, increasing to 26 at 1 Hz.",

author = "Robin Cantor and Lee, \{Luke P.\} and Mark Teepe and Vladimir Vinetskiy and Joseph Longo",

year = "1995",

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journal = "IEEE Transactions on Applied Superconductivity",

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T1 - Low-Noise, Single-Layer YBa2Cu3O7.x DC SQUID Magnetometers at 77 K

AU - Cantor, Robin

AU - Lee, Luke P.

AU - Teepe, Mark

AU - Vinetskiy, Vladimir

AU - Longo, Joseph

PY - 1995/6

Y1 - 1995/6

N2 - We describe a low-noise dc Superconducting QUantum Interference Device (SQUID) magnetometer that is fabricated from a single layer of YBa2Cu3O7-x on a 2 cm x 2 cm bicrystal substrate. The magnetometer design consists of a single-turn pickup loop that is directly coupled to a low inductance SQUID. Using conventional flux-locked loop electronics with bias current reversal, the white flux noise of several of these magnetometers operated at 77 K is observed to be as low as 2.2 above 10 kHz, increasing to about 5.7 at 1 Hz. The field-to-flux conversion efficiency is measured to be 4.6 nT/Φo, resulting in a white magnetic field noise of 10 fT/ above 10 kHz, increasing to 26 at 1 Hz.

AB - We describe a low-noise dc Superconducting QUantum Interference Device (SQUID) magnetometer that is fabricated from a single layer of YBa2Cu3O7-x on a 2 cm x 2 cm bicrystal substrate. The magnetometer design consists of a single-turn pickup loop that is directly coupled to a low inductance SQUID. Using conventional flux-locked loop electronics with bias current reversal, the white flux noise of several of these magnetometers operated at 77 K is observed to be as low as 2.2 above 10 kHz, increasing to about 5.7 at 1 Hz. The field-to-flux conversion efficiency is measured to be 4.6 nT/Φo, resulting in a white magnetic field noise of 10 fT/ above 10 kHz, increasing to 26 at 1 Hz.

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DO - 10.1109/77.403205

M3 - Article

AN - SCOPUS:0029324558

SN - 1051-8223

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EP - 2930

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 2

ER -

Low-Noise, Single-Layer YBa2Cu3O7.x DC SQUID Magnetometers at 77 K

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