Vortex fluctuation measurements in high Tc squids

Stephane Flament; M Lam Chok Sing; W Warsito; X Ridereau; C Gunther; L Mechin; D Bloyet; John Abell

doi:10.1088/0953-2048/17/5/018

Vortex fluctuation measurements in high Tc squids

Stephane Flament, M Lam Chok Sing, W Warsito, X Ridereau, C Gunther, L Mechin, D Bloyet, John Abell

Metallurgy and Materials

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Abstract

The correlation of the outputs of two dc-SQUIDs connected to the same solid washer was studied. A dedicated electronic system was used in order to operate both SQUIDs at the same time. It was found that the temporal correlation of the SQUID outputs is strongly dependent on the geometry of the SQUID loop. For a solid washer, the flux noise is mainly due to vortices located close to the SQUIDs. However, by surrounding the SQUID loop with a hole patterned in the superconducting solid washer, it is possible to drastically reduce the flux penetration around the loop. The resulting flux noise becomes dominated by vortices located inside the washer far from the SQUIDs. Magneto-optical images were also used to visualize the flux penetration inside the washer around the slit of such SQUIDs. These confirm previous descriptions of vortex penetration deduced from the electrical measurements.

Original language	English
Pages (from-to)	S180-S184
Journal	Superconductor Science & Technology
Volume	17
Early online date	2 Mar 2004
DOIs	https://doi.org/10.1088/0953-2048/17/5/018
Publication status	Published - 1 May 2004

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title = "Vortex fluctuation measurements in high Tc squids",

abstract = "The correlation of the outputs of two dc-SQUIDs connected to the same solid washer was studied. A dedicated electronic system was used in order to operate both SQUIDs at the same time. It was found that the temporal correlation of the SQUID outputs is strongly dependent on the geometry of the SQUID loop. For a solid washer, the flux noise is mainly due to vortices located close to the SQUIDs. However, by surrounding the SQUID loop with a hole patterned in the superconducting solid washer, it is possible to drastically reduce the flux penetration around the loop. The resulting flux noise becomes dominated by vortices located inside the washer far from the SQUIDs. Magneto-optical images were also used to visualize the flux penetration inside the washer around the slit of such SQUIDs. These confirm previous descriptions of vortex penetration deduced from the electrical measurements.",

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T1 - Vortex fluctuation measurements in high Tc squids

AU - Flament, Stephane

AU - Lam Chok Sing, M

AU - Warsito, W

AU - Ridereau, X

AU - Gunther, C

AU - Mechin, L

AU - Bloyet, D

AU - Abell, John

PY - 2004/5/1

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N2 - The correlation of the outputs of two dc-SQUIDs connected to the same solid washer was studied. A dedicated electronic system was used in order to operate both SQUIDs at the same time. It was found that the temporal correlation of the SQUID outputs is strongly dependent on the geometry of the SQUID loop. For a solid washer, the flux noise is mainly due to vortices located close to the SQUIDs. However, by surrounding the SQUID loop with a hole patterned in the superconducting solid washer, it is possible to drastically reduce the flux penetration around the loop. The resulting flux noise becomes dominated by vortices located inside the washer far from the SQUIDs. Magneto-optical images were also used to visualize the flux penetration inside the washer around the slit of such SQUIDs. These confirm previous descriptions of vortex penetration deduced from the electrical measurements.

AB - The correlation of the outputs of two dc-SQUIDs connected to the same solid washer was studied. A dedicated electronic system was used in order to operate both SQUIDs at the same time. It was found that the temporal correlation of the SQUID outputs is strongly dependent on the geometry of the SQUID loop. For a solid washer, the flux noise is mainly due to vortices located close to the SQUIDs. However, by surrounding the SQUID loop with a hole patterned in the superconducting solid washer, it is possible to drastically reduce the flux penetration around the loop. The resulting flux noise becomes dominated by vortices located inside the washer far from the SQUIDs. Magneto-optical images were also used to visualize the flux penetration inside the washer around the slit of such SQUIDs. These confirm previous descriptions of vortex penetration deduced from the electrical measurements.

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SP - S180-S184

JO - Superconductor Science & Technology

JF - Superconductor Science & Technology

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Vortex fluctuation measurements in high Tc squids

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