Analysis and improvement of the uniformity of magnetic field coil based on the cylindrical magnetic shield in atomic magnetometers

Pang, Haoying; Fan, Wenfeng; Liu, Feng; Wu, Zhihong; Yuan, Qi; Du, Pengcheng; Zhou, Xinxiu; Quan, Wei

doi:10.1016/j.sna.2022.114005

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…This could lead to the measured coil constants' deviation from the theoretical results. In the references, machining tolerances should be considered to obtain a very uniform magnetic field [45].…”

Section: Discussionmentioning

confidence: 99%

In Situ Study of the Magnetic Field Gradient Produced by a Miniature Bi-Planar Coil for Chip-Scale Atomic Devices

Chen,

Wang,

Zhang

et al. 2023

Micromachines

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The miniaturization of quantum sensors is a popular trend for the development of quantum technology. One of the key components of these sensors is a coil which is used for spin modulation and manipulation. The bi-planar coils have the advantage of producing three-dimensional magnetic fields with only two planes of current confinement, whereas the traditional Helmholtz coils require three-dimensional current distribution. Thus, the bi-planar coils are compatible with the current micro-fabrication process and are quite suitable for the compact design of the chip-scale atomic devices that require stable or modulated magnetic fields. This paper presents a design of a miniature bi-planar coil. Both the magnetic fields produced by the coils and their inhomogeneities were designed theoretically. The magnetic field gradient is a crucial parameter for the coils, especially for generating magnetic fields in very small areas. We used a NMR (Nuclear Magnetic Resonance) method based on the relaxation of 131Xe nuclear spins to measure the magnetic field gradient in situ. This is the first time that the field inhomogeneities of the field of such small bi-planar coils have been measured. Our results indicate that the designed gradient caused error is 0.08 for the By and the Bx coils, and the measured gradient caused error using the nuclear spin relaxation method is 0.09±0.02, suggesting that our method is suitable for measuring gradients. Due to the poor sensitivity of our magnetometer under a large Bz bias field, we could not measure the Bz magnetic field gradient. Our method also helps to improve the gradients of the miniature bi-planar coil design, which is critical for chip-scale atomic devices.

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Section: Discussionmentioning

confidence: 99%

In Situ Study of the Magnetic Field Gradient Produced by a Miniature Bi-Planar Coil for Chip-Scale Atomic Devices

Chen,

Wang,

Zhang

et al. 2023

Micromachines

View full text Add to dashboard Cite

show abstract

“…Even if the gradient magnetic field is relatively small in a stable system, a precise device cannot ignore the dephasing and relaxation errors caused by the gradient magnetic field. Examples include the equivalent gradient magnetic field for temperature [9], pump laser beam [10], and non-uniform magnetic field owing to the coupling of coils and magnetic shield [11]. This will cause the Larmor frequency of atoms in the sample cell to be slightly different in space and time and disrupt system performance.…”

Section: Introductionmentioning

confidence: 99%

The Xe isotope nuclear resonance frequency shift of NMR angular velocity sensors due to transverse gradient magnetic fields

Jie,

Liu

2024

J. Phys. D: Appl. Phys.

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The nuclear magnetic resonance (NMR) angular velocity sensor detects angular velocity by measuring the shift in the nuclear spin precession frequency, which is of fundamental interest. Recent studies have revealed the parameter dependency of nuclei frequency shifts induced by non-uniformly distributed polarized pump beams, temperature, and magnetic field properties. In this study, we investigated the effect of the linear transverse gradient magnetic field on the frequency ratio shift of the Xe isotope nuclear resonance frequency in the NMR sensors. A theoretical analysis method was proposed based on the Fermi contact interaction in atomic polarization and the spin-diffusion relaxation of 129Xe and 131Xe nuclei. The frequency ratio shift of the Xe isotope under different x-axis gradient magnetic fields was measured experimentally. Furthermore, we eliminated the equivalent residual magnetic field through a feedback system and compensated for the original gradient magnetic field in the system, which contributed to accurately revealing the frequency shift induced by the magnetic field gradient. The results indicate that the frequency ratio shift of the Xe isotope is proportional to the strength of the second-order linear transverse gradient magnetic field. This study provides a reference for the analysis and evaluation of the presence of the gradient magnetic field in the nuclear magnetic resonance angular velocity sensor.

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The optimization and stabilization of detuned probe light frequency to suppress electron spin polarization error in SERF co-magnetometer

Wei

Liu

et al. 2023

Sensors and Actuators A: Physical

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Analysis and improvement of the uniformity of magnetic field coil based on the cylindrical magnetic shield in atomic magnetometers

Cited by 9 publications

References 25 publications

In Situ Study of the Magnetic Field Gradient Produced by a Miniature Bi-Planar Coil for Chip-Scale Atomic Devices

In Situ Study of the Magnetic Field Gradient Produced by a Miniature Bi-Planar Coil for Chip-Scale Atomic Devices

The Xe isotope nuclear resonance frequency shift of NMR angular velocity sensors due to transverse gradient magnetic fields

The optimization and stabilization of detuned probe light frequency to suppress electron spin polarization error in SERF co-magnetometer

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