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

Department of Chemistry & Nanoscience

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

54 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

Bibliographical note

Funding Information:
Manuscript received October 17,1994. This work was supported in part by the Coastal Systems Station Dahlgren Div., Naval Surface Warfare Center, under Contract No. N61331-94-C-0049.

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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",

note = "Funding Information: Manuscript received October 17,1994. This work was supported in part by the Coastal Systems Station Dahlgren Div., Naval Surface Warfare Center, under Contract No. N61331-94-C-0049.",

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AU - Cantor, Robin

AU - Lee, Luke P.

AU - Teepe, Mark

AU - Vinetskiy, Vladimir

AU - Longo, Joseph

N1 - Funding Information: Manuscript received October 17,1994. This work was supported in part by the Coastal Systems Station Dahlgren Div., Naval Surface Warfare Center, under Contract No. N61331-94-C-0049.

PY - 1995/6

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

Abstract

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