Effects of modulation schemes on the performance of directly coupled high-Tc dc SQUID magnetometers

Jau Han Chen; Kuen Lin Chen; Hsiao Wen Yu; Ming Jye Chen; Chiu Hsien Wu; Jen Tzong Jeng; Herng Er Horng; Hong Chang Yang

doi:10.1109/77.919542

Effects of modulation schemes on the performance of directly coupled high-T_c dc SQUID magnetometers

Jau Han Chen^*, Kuen Lin Chen, Hsiao Wen Yu, Ming Jye Chen, Chiu Hsien Wu, Jen Tzong Jeng, Herng Er Horng, Hong Chang Yang

^*Corresponding author for this work

Undergraduate Program of Electro-Optical Engineering

Research output: Contribution to journal › Conference article › peer-review

4 Citations (Scopus)

Abstract

We have designed and fabricated the directly coupled YBa₂Cu₃O_7-δ dc SQUID magnetometers with two different modulation schemes to study the crosstalk effect in the on-chip multi-channel magnetometers. In one of the modulation schemes, the modulation current was directly injected into the SQUID body and the pick-up coil. The modulation efficiency was changed by the ratio of the modulation current flowing through the SQUID to the pick-up coil. In the other schemes, the modulation flux is mutually coupled through an external coil, and the modulation efficiency was changed by the mutual inductance of the external coil and the magnetometer. The results show that the modulation efficiency was varied when the value of self-inductance or the mutual inductance of SQUIDs change. Usually, lower modulation efficiency results in a higher crosstalk. The performance of magnetometers was also influenced by different modulation schemes. Their noise spectrum was compared as evidence.

Original language	English
Pages (from-to)	1110-1113
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	11
Issue number	1 I
DOIs	https://doi.org/10.1109/77.919542
Publication status	Published - 2001 Mar
Event	2000 Applied Superconductivity Conference - Virginia Beach, VA, United States Duration: 2000 Sept 17 → 2000 Sept 22

Keywords

Crosstalk
Electromagnetic interference
Magnetometers
SQUIDs
Superconducting devices

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1109/77.919542

Cite this

@article{f985d9ba2bcf459fb6ac47b0c83530a0,

title = "Effects of modulation schemes on the performance of directly coupled high-Tc dc SQUID magnetometers",

abstract = "We have designed and fabricated the directly coupled YBa2Cu3O7-δ dc SQUID magnetometers with two different modulation schemes to study the crosstalk effect in the on-chip multi-channel magnetometers. In one of the modulation schemes, the modulation current was directly injected into the SQUID body and the pick-up coil. The modulation efficiency was changed by the ratio of the modulation current flowing through the SQUID to the pick-up coil. In the other schemes, the modulation flux is mutually coupled through an external coil, and the modulation efficiency was changed by the mutual inductance of the external coil and the magnetometer. The results show that the modulation efficiency was varied when the value of self-inductance or the mutual inductance of SQUIDs change. Usually, lower modulation efficiency results in a higher crosstalk. The performance of magnetometers was also influenced by different modulation schemes. Their noise spectrum was compared as evidence.",

keywords = "Crosstalk, Electromagnetic interference, Magnetometers, SQUIDs, Superconducting devices",

author = "Chen, {Jau Han} and Chen, {Kuen Lin} and Yu, {Hsiao Wen} and Chen, {Ming Jye} and Wu, {Chiu Hsien} and Jeng, {Jen Tzong} and Horng, {Herng Er} and Yang, {Hong Chang}",

note = "Funding Information: Manuscript received September 18, 2000. This work was supported by the National Science Council of R.O.C. under Grants No. NSC-89-2112-M-002-029 and NSC-89-2112-M-002-028. Jau-Han Chen, Kuen-Lin Chen, Hsiao-Wen Yu, Ming-Jye Chen, Chiu-Hsien Wu, and Hong-Chang Yang are with the Department of Physics, National Taiwan University, Taipei 10617, Taiwan (e-mail: jhchen @ ieee.org). Jen-Tzong Jeng and Herng-Er Homg are with the Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan.; 2000 Applied Superconductivity Conference ; Conference date: 17-09-2000 Through 22-09-2000",

year = "2001",

month = mar,

doi = "10.1109/77.919542",

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volume = "11",

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journal = "IEEE Transactions on Applied Superconductivity",

issn = "1051-8223",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "1 I",

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TY - JOUR

T1 - Effects of modulation schemes on the performance of directly coupled high-Tc dc SQUID magnetometers

AU - Chen, Jau Han

AU - Chen, Kuen Lin

AU - Yu, Hsiao Wen

AU - Chen, Ming Jye

AU - Wu, Chiu Hsien

AU - Jeng, Jen Tzong

AU - Horng, Herng Er

AU - Yang, Hong Chang

N1 - Funding Information: Manuscript received September 18, 2000. This work was supported by the National Science Council of R.O.C. under Grants No. NSC-89-2112-M-002-029 and NSC-89-2112-M-002-028. Jau-Han Chen, Kuen-Lin Chen, Hsiao-Wen Yu, Ming-Jye Chen, Chiu-Hsien Wu, and Hong-Chang Yang are with the Department of Physics, National Taiwan University, Taipei 10617, Taiwan (e-mail: jhchen @ ieee.org). Jen-Tzong Jeng and Herng-Er Homg are with the Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan.

PY - 2001/3

Y1 - 2001/3

N2 - We have designed and fabricated the directly coupled YBa2Cu3O7-δ dc SQUID magnetometers with two different modulation schemes to study the crosstalk effect in the on-chip multi-channel magnetometers. In one of the modulation schemes, the modulation current was directly injected into the SQUID body and the pick-up coil. The modulation efficiency was changed by the ratio of the modulation current flowing through the SQUID to the pick-up coil. In the other schemes, the modulation flux is mutually coupled through an external coil, and the modulation efficiency was changed by the mutual inductance of the external coil and the magnetometer. The results show that the modulation efficiency was varied when the value of self-inductance or the mutual inductance of SQUIDs change. Usually, lower modulation efficiency results in a higher crosstalk. The performance of magnetometers was also influenced by different modulation schemes. Their noise spectrum was compared as evidence.

AB - We have designed and fabricated the directly coupled YBa2Cu3O7-δ dc SQUID magnetometers with two different modulation schemes to study the crosstalk effect in the on-chip multi-channel magnetometers. In one of the modulation schemes, the modulation current was directly injected into the SQUID body and the pick-up coil. The modulation efficiency was changed by the ratio of the modulation current flowing through the SQUID to the pick-up coil. In the other schemes, the modulation flux is mutually coupled through an external coil, and the modulation efficiency was changed by the mutual inductance of the external coil and the magnetometer. The results show that the modulation efficiency was varied when the value of self-inductance or the mutual inductance of SQUIDs change. Usually, lower modulation efficiency results in a higher crosstalk. The performance of magnetometers was also influenced by different modulation schemes. Their noise spectrum was compared as evidence.

KW - Crosstalk

KW - Electromagnetic interference

KW - Magnetometers

KW - SQUIDs

KW - Superconducting devices

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