Thin-Film-Based Ultralow Noise SQUID Magnetometer

Schmelz, M.; Zakosarenko, V.; Chwala, A.; Schönau, Thomas; Stolz, R.; Anders, S.; Linzen, S.; Meyer, H.‐G.

doi:10.1109/tasc.2016.2530699

Cited by 35 publications

(20 citation statements)

References 15 publications

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“…However, for all measurement cases, where highest possible magnetic field resolution is needed, for a long time Superconducting Quantum Interference Devices (SQUIDs) were the only choice. SQUIDs can reach noise-limited magnetic field resolutions of B n < 1 fT/√Hz [11,12], but need cryogenic cooling for operation Therefore, also optically pumped magnetometers (OPMs) [13] have been used in magnetometry since several decades [14]. OPMs are based on the interaction of atomic spins with an external magnetic field B 0 to be measured [15,16].…”

Section: Introductionmentioning

confidence: 99%

An Optically Pumped Magnetometer Working in the Light-Shift Dispersed Mz Mode

Schultze

Schillig

IJsselsteijn³

et al. 2017

Sensors

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We present an optically pumped magnetometer working in a new operational mode—the light-shift dispersed Mz (LSD-Mz) mode. It is realized combining various features; (1) high power off-resonant optical pumping; (2) Mz configuration, where pumping light and magnetic field of interest are oriented parallel to each other; (3) use of small alkali metal vapor cells of identical properties in integrated array structures, where two such cells are pumped by circularly polarized light of opposite helicity; and (4) subtraction of the Mz signals of these two cells. The LSD-Mz magnetometer’s performance depends on the inherent and very complex interplay of input parameters. In order to find the configuration of optimal magnetometer resolution, a sensitivity analysis of the input parameters by means of Latin Hypercube Sampling was carried out. The resulting datasets of the multi-dimensional parameter space exploration were assessed by a subsequent physically reasonable interpretation. Finally, the best shot-noise limited magnetic field resolution was determined within that parameter space. As the result, using two 50 mm3 integrated vapor cells a magnetic field resolution below 10 fT/√Hz at Earth’s magnetic field strength is possible.

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Section: Introductionmentioning

confidence: 99%

An Optically Pumped Magnetometer Working in the Light-Shift Dispersed Mz Mode

Schultze

Schillig

IJsselsteijn³

et al. 2017

Sensors

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show abstract

“…For frequencies higher than HF, standard Faraday coil detection becomes more sensitive. At lower frequencies, super-conducting quantum interference devices (SQUIDs) [18] and atomic magnetometers rival one another for better sensitivity [11,17,19]. Adoption of SQUIDs is hampered by the need for cryogenics for operation.…”

Section: Introductionmentioning

confidence: 99%

Atomic Magnetometer Multisensor Array for rf Interference Mitigation and Unshielded Detection of Nuclear Quadrupole Resonance

et al. 2016

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An array of four 87 Rb vector magnetometers are used to detect nuclear quadrupole resonance (NQR) signals in an unshielded environment at 1 MHz. With a baseline of 25 cm, the length of the array, radio-frequency interference mitigation (RFIM) is also demonstrated; a radio-station signal is suppressed by a factor of 20 without degradation to the signal of interest. With these compact sensors, in which the probe beam passes through twice, the fundamental limit to detection sensitivity is found to be photon shot noise. More passes of the probe beam overcome this limitation. With a sensor of similar effective volume, 0.25 cm 3 , but 25 times more passes, the sensitivity is improved by an order of magnitude to 1.7 ± 0.2 fT/ √ Hz.

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“…Vapor-cell magnetometry is second to none in magnetic sensitivity; the demonstrated ≈ 160 aT √ Hz by M. Romalis' group at Princeton [3] is among the most sensitive magnetic field measurements, only matched by SQUID systems (superconducting quantum interference devices) requiring cryogenics [4,5]. The sensitivity of vapor-cell magnetometers improves with size; for a given density the more atoms one can probe the better.…”

Section: Optically-pumped Magnetometersmentioning

confidence: 99%

Sensitive magnetometry in challenging environments

Fu¹,

Iwata²,

Wickenbrock³

et al. 2020

Preprint

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State-of-the-art magnetic field measurements performed in shielded environments with carefully controlled conditions rarely reflect the realities of those applications envisioned in the introductions of peer-reviewed publications. Nevertheless, significant advances in magnetometer sensitivity have been accompanied by serious attempts to bring these magnetometers into the challenging working environments in which they are often required. In this review, we cover the ways in which various magnetometer technologies have been adapted for use in challenging environments.

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Thin-Film-Based Ultralow Noise SQUID Magnetometer

Cited by 35 publications

References 15 publications

An Optically Pumped Magnetometer Working in the Light-Shift Dispersed Mz Mode

An Optically Pumped Magnetometer Working in the Light-Shift Dispersed Mz Mode

Atomic Magnetometer Multisensor Array for rf Interference Mitigation and Unshielded Detection of Nuclear Quadrupole Resonance

Sensitive magnetometry in challenging environments

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