Application of spin-exchange relaxation-free magnetometry to the Cosmic Axion Spin Precession Experiment

Wang, Tao; Kimball, Derek F. Jackson; Sushkov, Alexander O.; Aybas, Deniz; Blanchard, John W.; Centers, Gary P.; Kelley, Sean R. O; Wickenbrock, Arne; Fang, Jiancheng; Budker, Dmitry

doi:10.1016/j.dark.2017.11.003

Cited by 58 publications

(28 citation statements)

References 56 publications

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“…Since that, currents of large intensities are adopted in the X and Y directions. The curves coincided well with the data using (7). The adjusted R 2 of linear fittings for the X, Y, and Z axes are 0.9893, 0.9776, and 0.9256, respectively.…”

Section: Resultssupporting

confidence: 75%

“…Atomic magnetometer, with the rapid development of recent decades [1][2][3], has been reported as the most sensitive known magnetic measurement instrument. It has found many applications such as geomagnetism [4], medical imaging [5,6], and fundamental physics [7,8]. At least, one set of triaxial magnetic coil system is required in the magnetometer to supply direct current (DC) or alternating current (AC) field.…”

Section: Introductionmentioning

confidence: 99%

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A Coil Constant Calibration Method Based on the Phase-Frequency Response of Alkali Atomic Magnetometer

Yao

Zhao

et al. 2019

Photonic Sens

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We propose an in-situ method to calibrate the coil constants of the optical atomic magnetometer. This method is based on measuring the Larmor precession of spin polarized alkali metal atoms and has been demonstrated on a K-Rb hybrid atomic magnetometer. Oscillation fields of different frequencies are swept on the transverse coil. By extracting the resonance frequency through phase-frequency analysis of electron spin projection, the coil constants are calibrated to be 323.1 ± 0.28 nT/mA, 108 ± 0.04 nT/Ma, and 185.8 ± 1.03 nT/mA along the X, Y, and Z directions, respectively.

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Section: Resultssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

A Coil Constant Calibration Method Based on the Phase-Frequency Response of Alkali Atomic Magnetometer

Yao

Zhao

et al. 2019

Photonic Sens

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“…The diamagnetism of the superconductor can shield out most of the external magnetic field, which is useful, for example, in searching for dark matter or exotic spin-dependent interactions [12,13]. Furthermore, a superconducting flux transformer proposed in [24,25] can help the needle magnetometer to measure external oscillating magnetic fields.…”

Section: Approach To Magnetometry Beyond the Standard Quantum Limitmentioning

confidence: 99%

Dynamics of a Ferromagnetic Particle Levitated over a Superconductor

et al. 2019

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Under conditions where the angular momentum of a ferromagnetic particle is dominated by intrinsic spin, applied torque is predicted to cause gyroscopic precession of the particle. If the particle is sufficiently isolated from the environment, a measurement of spin precession can potentially yield sensitivity to torque beyond the standard quantum limit. Levitation of a micron-scale ferromagnetic particle above a superconductor is a possible method of near frictionless suspension enabling observation of ferromagnetic particle precession and ultrasensitive torque measurements. We experimentally investigate the dynamics of a micron-scale ferromagnetic particle levitated above a superconducting niobium surface. We find that the levitating particles are trapped in potential minima associated with residual magnetic flux pinned by the superconductor and, using an optical technique, characterize the quasiperiodic motion of the particles in these traps.

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“…Atomic magnetometers may also be used at low frequencies, in particular with zero and ultralow magnetic fields as suggested in Ref. [40].…”

Section: Sensitivitymentioning

confidence: 99%

The cosmic axion spin precession experiment (CASPEr): a dark-matter search with nuclear magnetic resonance

Garcon

Aybas

Blanchard

et al. 2017

Quantum Sci. Technol.

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The Cosmic Axion Spin Precession Experiment (CASPEr) is a nuclear magnetic resonance experiment (NMR) seeking to detect axion and axion-like particles which could make up the dark matter present in the universe. We review the predicted couplings of axions and axion-like particles with baryonic matter that enable their detection via NMR. We then describe two measurement schemes being implemented in CASPEr. The first method, presented in the original CASPEr proposal, consists of a resonant search via continuouswave NMR spectroscopy. This method offers the highest sensitivity for frequencies ranging from a few Hz to hundreds of MHz, corresponding to masses m a ∼ 10 −14 -10 −6 eV. Sub-Hz frequencies are typically difficult to probe with NMR due to the diminishing sensitivity of magnetometers in this region. To circumvent this limitation, we suggest new detection and data processing modalities. We describe a non-resonant frequency-modulation detection scheme, enabling searches from mHz to Hz frequencies (m a ∼ 10 −17 -10 −14 eV), extending the detection bandwidth by three decades.

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Application of spin-exchange relaxation-free magnetometry to the Cosmic Axion Spin Precession Experiment

Abstract: The Cosmic Axion Spin Precession Experiment (CASPEr) seeks to measure oscillating torques on nuclear spins caused by axion or axion-like-particle (ALP) dark matter via nuclear magnetic resonance (NMR) techniques. A sample spin-

Cited by 58 publications

References 56 publications

A Coil Constant Calibration Method Based on the Phase-Frequency Response of Alkali Atomic Magnetometer

A Coil Constant Calibration Method Based on the Phase-Frequency Response of Alkali Atomic Magnetometer

Dynamics of a Ferromagnetic Particle Levitated over a Superconductor

The cosmic axion spin precession experiment (CASPEr): a dark-matter search with nuclear magnetic resonance

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