A superconductor/TMR composite magnetic sensor for pico-Tesla magnetic field detection

Kun Sun; Lan Yang; Peisen Li; Jun Tao; Xinmiao Zhang; Minhui Ji; Junping Peng; Mengchun Pan; Dixiang Chen; Jiafei Hu; Weicheng Qiu; Qi Zhang; Yueguo Hu

doi:10.1063/5.0096826

AIP Advances (Oct 2022)

A superconductor/TMR composite magnetic sensor for pico-Tesla magnetic field detection

Kun Sun,
Lan Yang,
Peisen Li,
Jun Tao,
Xinmiao Zhang,
Minhui Ji,
Junping Peng,
Mengchun Pan,
Dixiang Chen,
Jiafei Hu,
Weicheng Qiu,
Qi Zhang,
Yueguo Hu

Affiliations

Kun Sun: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Lan Yang: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Peisen Li: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Jun Tao: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Xinmiao Zhang: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Minhui Ji: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Junping Peng: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Mengchun Pan: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Dixiang Chen: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Jiafei Hu: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Weicheng Qiu: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Qi Zhang: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China
Yueguo Hu: College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China

DOI: https://doi.org/10.1063/5.0096826
Journal volume & issue: Vol. 12, no. 10
pp. 105003 – 105003-9

Abstract

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A highly sensitive superconductor/tunnel magnetoresistance (TMR) composite magnetic sensor was designed and fabricated to satisfy the demands of detecting weak magnetic fields down to the pT range at low frequencies. First, analysis of the 1/f noise provided an optimized design scheme for the TMR unit to reduce the noise level. Then, the key structural parameters of the superconducting flux transformation amplifier (SFTA) were optimized with focus on the bonding quality between SFTA and TMR units using the finite element method to enhance the magnetic field magnification factor. An SFTA–TMR composite method with secondary alignment and multi-step bonding was proposed to fabricate the composite magnetic sensor and ensure the designed bonding gap and alignment accuracy. Experiments showed that the magnetic field sensitivity reached 5 pT/Hz0.5 (@ 13 Hz), which is beyond the highest level of superconductor/TMR composite magnetic sensors reported to date and is a further step toward the application of weak magnetic field detection.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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