Position and Direction Tracking of a Magnetic Object Based on an Mx-Atomic Magnetometer

Soheilian, Asieh; Ranjbaran, M.; Tehranchi, M.M.

doi:10.1038/s41598-020-57923-w

Cited by 12 publications

(9 citation statements)

References 40 publications

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“…The resonance frequency is related to the stray magnetic field (B 0 ) of the solenoid on the cell location that was calculated as 4250 Hz. The sensitivity of the atomic magnetometer was obtained in the order of pT by measuring its noise spectral density 29 . Using the phase-locked loop, we measured any variation of light intensity associated with the deviation of the frequency δf and resonance curve slope which were proportional to the magnetic field and local magnetic field gradient of the moving magnetic target, respectively 29 .…”

Section: Experimental Setupsmentioning

confidence: 99%

“…Based on the results, the spike-like signal is produced by simultaneous changing the magnetic field and the local magnetic field gradient of the moving magnetic target. Magnetic target with stronger magnetization produces a stronger signal and the orientation of the velocity can inverse the amplitude of the signal 29 . However, the dependency of the signal to instantaneous velocity was ambiguous.…”

Section: Introductionmentioning

confidence: 99%

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Detection of magnetic tracers with Mx atomic magnetometer for application to blood velocimetry

Soheilian

Tehranchi

Ranjbaran

2021

Sci Rep

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In the new generation of blood velocimeter systems, considerable attention has been paid to atomic magnetometers due to their high resolution and high sensitivity for detection of magnetic tracers. Passing the magnetic tracers adjacent to the atomic magnetometer produces a spike-like signal, the shape of which depends on the position of the tracer, as well as its velocity and orientation. The present study aimed to evaluate the effect of abrupt variations in the instantaneous velocity of the magnetic tracer on the magnetometer response compare to constant velocity. Modeling the magnetic tracer as a dipole moment indicated that the velocity dependence of the magnetic field and local magnetic field gradient associated with moving magnetic tracer cause the spike-like signal to go out of symmetry in the case of variable velocity. Based on the experimental results, any instantaneous variation in tracer velocity leads to shrinkage in the signal width. The behavior has been studied for both magnetic microwire with variable instantaneous velocity and magnetic droplets in stenosis artery phantom. In addition, the position of the tracer could be detected by following the shrinkage behavior which may occur on the peak, valley, or both. These advantageous outcomes can be applied for high sensitivity diagnosis of arterial stenosis.

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Section: Experimental Setupsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detection of magnetic tracers with Mx atomic magnetometer for application to blood velocimetry

Soheilian

Tehranchi

Ranjbaran

2021

Sci Rep

Self Cite

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“…Optical interrogation of magnetic fields could be used to study spintronic materials that lack inherently strong Kerr effects, [1] improve the resolution of magnetic resonance images (MRI), [2] and locate magnetic nanoparticles in biological assays. [3] Traditional approaches to magnetic field imaging that exploit weak magneto-optical interactions such as the Faraday effect are typically reliant on expensive effectiveness in avian magnetoreception, exploiting the magnetic field dependence of spin interactions in small organic molecules and nanoparticles may provide a compelling alternative to conventional magneto-optical materials for magnetic sensing.…”

Section: Introductionmentioning

confidence: 99%

Magnetic‐Field‐Switchable Laser via Optical Pumping of Rubrene

et al. 2021

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crystalline materials, garnets, or rare earth-doped paramagnetic glasses and are thus poorly suited to large-area and volumetric imaging. [4] Nitrogen vacancy (NV) centers provide high sensitivity to magnetic fields (on the order of 1 nT Hz −1/2 for a single NV center), [5] but NVs suffer from weak optical cross section, a requirement for high resolution detection of their emission wavelength, and difficult calibration. [6] Magnetic imaging applications would benefit from stronger optomagnetic interactions within biocompatible materials such as molecules or nanoparticles, which could be directly incorporated within a sample or bioassay. [7] Nanomaterials for magnetic imaging are ideally also capable of high-resolution imaging and operation at high photon flux, potentially even in microlasers, where brilliant emission and high spectral sensitivity creates new opportunities to monitor a wide range of physiological parameters with cellular resolution. [8] New optomagnetic effects in fluorescent or electroluminescent materials could be used to modulate lasers and may even find new applications in optical modulators, which presently rely on weak thermal or electro-optic effects.One alternative to conventional magneto-optical materials is suggested by proposed explanations for the sensitivity of birds to Earth's magnetic field. Recent studies suggest that birds are able to orient themselves to Earth's magnetic field by exploiting the magnetic sensitivity of electronic interactions in their retinas. [9,10] Photoexcitation of proteins in avian retinas produce radical (unpaired electron) intermediate states, which then interact with spin-1 excitons (electron-hole pairs), also known as triplet excitons. To understand the basis for the magnetic dependence of these interactions, consider an asymmetric molecule, for which the three triplet states of the spin-1 exciton are energetically split even in the absence of a magnetic field. Typically, without substantial spin-orbit coupling, this zero-field splitting is less than about 10 μeV. [11] Therefore, an external magnetic field on the order of 10 μeV μ B −1 (≈0.2 T), where μ B is the Bohr magneton, can reorder the triplet states via the Zeeman effect, modulating their involvement in spindependent interactions. The magnetic field sensitivity is typically even higher for an unpaired electron with no zero-field splitting. Consequently, both triplet-triplet and triplet-charge interactions can undergo magnetic field modulation. Given its Volumetric optical imaging of magnetic fields is challenging with existing magneto-optical materials, motivating the search for dyes with strong magnetic field interactions, distinct emission spectra, and an ability to withstand high photon flux and incorporation within samples. Here, the magnetic field effect on singlet-exciton fission is exploited to demonstrate spatial imaging of magnetic fields in a thin film of rubrene. Doping rubrene with the highquantum yield dye dibenzotetraphenylperiflanthene (DBP) is shown to enable optically pumped, slab...

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“…Optically pumped atomic magnetometers are the most sensitive room-temperature magnetic sensors, which rely on precision measurements of atomic spin states under magnetic fields [ 1 ]. The sensitivity surpassing fT/Hz 1/2 level has been reported in a spin-exchange-free regime (SERF) [ 2 ], and the absence of cryogenic cooling makes it favorable for a wide range of applications, such as tracking of magnetic objects [ 3 , 4 ], space exploration [ 5 ], and medical signal detection [ 6 , 7 , 8 ]. In particular, miniaturization based on microfabricated vapor cells [ 9 , 10 , 11 ] paves the way towards mass-producible low-power versions of atomic magnetometers, namely chip-scale atomic magnetometers (CSAMs).…”

Section: Introductionmentioning

confidence: 99%

Chip-Scale Ultra-Low Field Atomic Magnetometer Based on Coherent Population Trapping

Hong

Park

Lee

et al. 2021

Sensors

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We report a chip-scale atomic magnetometer based on coherent population trapping, which can operate near zero magnetic field. By exploiting the asymmetric population among magnetic sublevels in the hyperfine ground state of cesium, we observe that the resonance signal acquires sensitivity to magnetic field in spite of degeneracy. A dispersive signal for magnetic field discrimination is obtained near-zero-field as well as for finite fields (tens of micro-tesla) in a chip-scale device of 0.94 cm3 volume. This shows that it can be readily used in low magnetic field environments, which have been inaccessible so far in miniaturized atomic magnetometers based on coherent population trapping. The measured noise floor of 300 pT/Hz1/2 at the zero-field condition is comparable to that of the conventional finite-field measurement obtained under the same conditions. This work suggests a way to implement integrated atomic magnetometers with a wide operating range.

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Position and Direction Tracking of a Magnetic Object Based on an Mx-Atomic Magnetometer

Cited by 12 publications

References 40 publications

Detection of magnetic tracers with Mx atomic magnetometer for application to blood velocimetry

Detection of magnetic tracers with Mx atomic magnetometer for application to blood velocimetry

Magnetic‐Field‐Switchable Laser via Optical Pumping of Rubrene

Chip-Scale Ultra-Low Field Atomic Magnetometer Based on Coherent Population Trapping

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