Multichannel SQUID magnetometry using double relaxation oscillation SQUIDs

Michiel J. van Duuren, Y.H. Lee, Derk Jan Adelerhof, J. Kawai, H. Kado, Jaap Flokstra, Horst Rogalla

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Abstract

A highly sensitive first-order gradiometer based on double relaxation oscillation SQUID's (DROS's) for multichannel use is presented. The white flux noise level of the bare DROS's is 4.5 μΦ0/√Hz (ε=275 h). With wire-wound first-order gradiometers, having a baseline of 40 mm, the white magnetic field noise equals 4 fT/√Hz. As a result of the high flux-to-voltage transfer of the DROS's of about 1 mV/Φ0, this low noise level could be obtained with simple room-temperature flux locked loop electronics based on direct voltage readout. The relaxation frequency of the present DROS's is approximately 1 GHz. No degradation of the DROS characteristics caused by interference between relaxation oscillations in two adjacent channels has been observed, although the gradiometers are spaced by less than 1 mm. This shows that DROS's can be used in multichannel SQUID magnetometers.
Original languageEnglish
Pages (from-to)38-44
Number of pages7
JournalIEEE transactions on applied superconductivity
Volume6
Issue number1
DOIs
Publication statusPublished - 1996

Fingerprint

SQUIDs
magnetic measurement
oscillations
gradiometers
Fluxes
Electric potential
Magnetometers
Magnetometry
electric potential
low noise
magnetometers
Electronic equipment
readout
Wire
Magnetic fields
Degradation
wire
degradation
interference
room temperature

Cite this

van Duuren, Michiel J. ; Lee, Y.H. ; Adelerhof, Derk Jan ; Kawai, J. ; Kado, H. ; Flokstra, Jaap ; Rogalla, Horst. / Multichannel SQUID magnetometry using double relaxation oscillation SQUIDs. In: IEEE transactions on applied superconductivity. 1996 ; Vol. 6, No. 1. pp. 38-44.
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title = "Multichannel SQUID magnetometry using double relaxation oscillation SQUIDs",
abstract = "A highly sensitive first-order gradiometer based on double relaxation oscillation SQUID's (DROS's) for multichannel use is presented. The white flux noise level of the bare DROS's is 4.5 μΦ0/√Hz (ε=275 h). With wire-wound first-order gradiometers, having a baseline of 40 mm, the white magnetic field noise equals 4 fT/√Hz. As a result of the high flux-to-voltage transfer of the DROS's of about 1 mV/Φ0, this low noise level could be obtained with simple room-temperature flux locked loop electronics based on direct voltage readout. The relaxation frequency of the present DROS's is approximately 1 GHz. No degradation of the DROS characteristics caused by interference between relaxation oscillations in two adjacent channels has been observed, although the gradiometers are spaced by less than 1 mm. This shows that DROS's can be used in multichannel SQUID magnetometers.",
author = "{van Duuren}, {Michiel J.} and Y.H. Lee and Adelerhof, {Derk Jan} and J. Kawai and H. Kado and Jaap Flokstra and Horst Rogalla",
year = "1996",
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Multichannel SQUID magnetometry using double relaxation oscillation SQUIDs. / van Duuren, Michiel J.; Lee, Y.H.; Adelerhof, Derk Jan; Kawai, J.; Kado, H.; Flokstra, Jaap; Rogalla, Horst.

In: IEEE transactions on applied superconductivity, Vol. 6, No. 1, 1996, p. 38-44.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Multichannel SQUID magnetometry using double relaxation oscillation SQUIDs

AU - van Duuren, Michiel J.

AU - Lee, Y.H.

AU - Adelerhof, Derk Jan

AU - Kawai, J.

AU - Kado, H.

AU - Flokstra, Jaap

AU - Rogalla, Horst

PY - 1996

Y1 - 1996

N2 - A highly sensitive first-order gradiometer based on double relaxation oscillation SQUID's (DROS's) for multichannel use is presented. The white flux noise level of the bare DROS's is 4.5 μΦ0/√Hz (ε=275 h). With wire-wound first-order gradiometers, having a baseline of 40 mm, the white magnetic field noise equals 4 fT/√Hz. As a result of the high flux-to-voltage transfer of the DROS's of about 1 mV/Φ0, this low noise level could be obtained with simple room-temperature flux locked loop electronics based on direct voltage readout. The relaxation frequency of the present DROS's is approximately 1 GHz. No degradation of the DROS characteristics caused by interference between relaxation oscillations in two adjacent channels has been observed, although the gradiometers are spaced by less than 1 mm. This shows that DROS's can be used in multichannel SQUID magnetometers.

AB - A highly sensitive first-order gradiometer based on double relaxation oscillation SQUID's (DROS's) for multichannel use is presented. The white flux noise level of the bare DROS's is 4.5 μΦ0/√Hz (ε=275 h). With wire-wound first-order gradiometers, having a baseline of 40 mm, the white magnetic field noise equals 4 fT/√Hz. As a result of the high flux-to-voltage transfer of the DROS's of about 1 mV/Φ0, this low noise level could be obtained with simple room-temperature flux locked loop electronics based on direct voltage readout. The relaxation frequency of the present DROS's is approximately 1 GHz. No degradation of the DROS characteristics caused by interference between relaxation oscillations in two adjacent channels has been observed, although the gradiometers are spaced by less than 1 mm. This shows that DROS's can be used in multichannel SQUID magnetometers.

U2 - 10.1109/77.488279

DO - 10.1109/77.488279

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JO - IEEE transactions on applied superconductivity

JF - IEEE transactions on applied superconductivity

SN - 1051-8223

IS - 1

ER -