A highly sensitive YBCO serial SQUID magnetometer with a flux focuser

C. H. Wu; M. H. Hsu; K. L. Chen; J. C. Chen; J. T. Jeng; T. S. Lai; Herng Er Horng; Hong Chang Yang

doi:10.1088/0953-2048/19/5/S17

A highly sensitive YBCO serial SQUID magnetometer with a flux focuser

C. H. Wu, M. H. Hsu, K. L. Chen, J. C. Chen, J. T. Jeng, T. S. Lai, Herng Er Horng, Hong Chang Yang^*

^*Corresponding author for this work

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

15 Citations (Scopus)

Abstract

We have designed and fabricated a low noise, high T_c superconducting quantum interference device (SQUID) magnetometer with an improved yield. In order to reduce the field noise level of the magnetometer, we increased the voltage modulation depth with a series SQUID array and enhanced the effective area with a flux focuser. Ten washer-type SQUIDs were connected in series, thereby increasing the voltage flux transfer function by a factor of 10. An enhancement in effective area by a factor of 5 was achieved by coupling the 10-SQUID array to a single-layered flux focuser. For the directly coupled SQUID array magnetometer, the yield was improved by selecting the best SQUIDs to have in series in order to reduce the flux noise. The magnetic field sensitivity of 40 fT Hz^-1/2 in the white regime and 100 fT Hz ^-1/2 at 1 Hz is demonstrated by using a single layer of high T _c film. The proposed high yield magnetometers would be suitable for building low noise multi-channel magnetocardiographs.

Original language	English
Pages (from-to)	S246-S250
Journal	Superconductor Science and Technology
Volume	19
Issue number	5
DOIs	https://doi.org/10.1088/0953-2048/19/5/S17
Publication status	Published - 2006 May
Externally published	Yes

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

Access to Document

10.1088/0953-2048/19/5/S17

Cite this

@article{1993d767698b4b8792e41348b1a3b7c5,

title = "A highly sensitive YBCO serial SQUID magnetometer with a flux focuser",

abstract = "We have designed and fabricated a low noise, high Tc superconducting quantum interference device (SQUID) magnetometer with an improved yield. In order to reduce the field noise level of the magnetometer, we increased the voltage modulation depth with a series SQUID array and enhanced the effective area with a flux focuser. Ten washer-type SQUIDs were connected in series, thereby increasing the voltage flux transfer function by a factor of 10. An enhancement in effective area by a factor of 5 was achieved by coupling the 10-SQUID array to a single-layered flux focuser. For the directly coupled SQUID array magnetometer, the yield was improved by selecting the best SQUIDs to have in series in order to reduce the flux noise. The magnetic field sensitivity of 40 fT Hz-1/2 in the white regime and 100 fT Hz -1/2 at 1 Hz is demonstrated by using a single layer of high T c film. The proposed high yield magnetometers would be suitable for building low noise multi-channel magnetocardiographs.",

author = "Wu, {C. H.} and Hsu, {M. H.} and Chen, {K. L.} and Chen, {J. C.} and Jeng, {J. T.} and Lai, {T. S.} and Horng, {Herng Er} and Yang, {Hong Chang}",

year = "2006",

month = may,

doi = "10.1088/0953-2048/19/5/S17",

language = "English",

volume = "19",

pages = "S246--S250",

journal = "Superconductor Science and Technology",

issn = "0953-2048",

publisher = "IOP Publishing Ltd.",

number = "5",

}

TY - JOUR

T1 - A highly sensitive YBCO serial SQUID magnetometer with a flux focuser

AU - Wu, C. H.

AU - Hsu, M. H.

AU - Chen, K. L.

AU - Chen, J. C.

AU - Jeng, J. T.

AU - Lai, T. S.

AU - Horng, Herng Er

AU - Yang, Hong Chang

PY - 2006/5

Y1 - 2006/5

N2 - We have designed and fabricated a low noise, high Tc superconducting quantum interference device (SQUID) magnetometer with an improved yield. In order to reduce the field noise level of the magnetometer, we increased the voltage modulation depth with a series SQUID array and enhanced the effective area with a flux focuser. Ten washer-type SQUIDs were connected in series, thereby increasing the voltage flux transfer function by a factor of 10. An enhancement in effective area by a factor of 5 was achieved by coupling the 10-SQUID array to a single-layered flux focuser. For the directly coupled SQUID array magnetometer, the yield was improved by selecting the best SQUIDs to have in series in order to reduce the flux noise. The magnetic field sensitivity of 40 fT Hz-1/2 in the white regime and 100 fT Hz -1/2 at 1 Hz is demonstrated by using a single layer of high T c film. The proposed high yield magnetometers would be suitable for building low noise multi-channel magnetocardiographs.

AB - We have designed and fabricated a low noise, high Tc superconducting quantum interference device (SQUID) magnetometer with an improved yield. In order to reduce the field noise level of the magnetometer, we increased the voltage modulation depth with a series SQUID array and enhanced the effective area with a flux focuser. Ten washer-type SQUIDs were connected in series, thereby increasing the voltage flux transfer function by a factor of 10. An enhancement in effective area by a factor of 5 was achieved by coupling the 10-SQUID array to a single-layered flux focuser. For the directly coupled SQUID array magnetometer, the yield was improved by selecting the best SQUIDs to have in series in order to reduce the flux noise. The magnetic field sensitivity of 40 fT Hz-1/2 in the white regime and 100 fT Hz -1/2 at 1 Hz is demonstrated by using a single layer of high T c film. The proposed high yield magnetometers would be suitable for building low noise multi-channel magnetocardiographs.

UR - http://www.scopus.com/inward/record.url?scp=33645538515&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33645538515&partnerID=8YFLogxK

U2 - 10.1088/0953-2048/19/5/S17

DO - 10.1088/0953-2048/19/5/S17

M3 - Article

AN - SCOPUS:33645538515

SN - 0953-2048

VL - 19

SP - S246-S250

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

IS - 5

ER -

A highly sensitive YBCO serial SQUID magnetometer with a flux focuser

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this