Magnetometer ≈ Magnetometer
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Sensitivity optimization for NV-diamond magnetometry Open
Solid-state spin systems including nitrogen-vacancy (NV) centers in diamond constitute an increasingly favored quantum sensing platform. However, present NV ensemble devices exhibit sensitivities orders of magnitude away from theoretical l…
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Measurement of the Permanent Electric Dipole Moment of the Neutron Open
We present the result of an experiment to measure the electric dipole moment (EDM) of the neutron at the Paul Scherrer Institute using Ramsey's method of separated oscillating magnetic fields with ultracold neutrons. Our measurement stands…
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Broadband and Resonant Approaches to Axion Dark Matter Detection Open
When ultralight axion dark matter encounters a static magnetic field, it sources an effective electric current that follows the magnetic field lines and oscillates at the axion Compton frequency. We propose a new experiment to detect this …
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Submillihertz magnetic spectroscopy performed with a nanoscale quantum sensor Open
Enhancing quantum sensing The quantum properties of the nitrogen vacancy (NV) defect in diamond can be used as an atomic compass needle that is sensitive to tiny variations in magnetic field. Schmitt et al. and Boss et al. successfully enh…
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Optically pumped magnetometers: From quantum origins to multi-channel magnetoencephalography Open
Optically Pumped Magnetometers (OPMs) have emerged as a viable and wearable alternative to cryogenic, superconducting MEG systems. This new generation of sensors has the advantage of not requiring cryogenic cooling and as a result can be f…
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The Juno Magnetic Field Investigation Open
The Juno Magnetic Field investigation (MAG) characterizes Jupiter's planetary magnetic field and magnetosphere, providing the first globally distributed and proximate measurements of the magnetic field of Jupiter. The magnetic field instru…
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Magnetoencephalography with optically pumped magnetometers (OPM-MEG): the next generation of functional neuroimaging Open
Magnetoencephalography (MEG) measures human brain function via assessment of the magnetic fields generated by electrical activity in neurons. Despite providing high-quality spatiotemporal maps of electrophysiological activity, current MEG …
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A vibrating beam MEMS accelerometer for gravity and seismic measurements Open
This paper introduces a differential vibrating beam MEMS accelerometer demonstrating excellent long-term stability for applications in gravimetry and seismology. The MEMS gravimeter module demonstrates an output Allan deviation of 9 μGal f…
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Direct visualization of magnetic domains and moiré magnetism in twisted 2D magnets Open
Imaging twisty magnets Twisting monolayers of graphene with respect to each other has led to a number of unusual correlated states. This approach has inspired researchers to try their hand at twisting two-dimensional (2D) magnets, but such…
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The Solar Orbiter magnetometer Open
The magnetometer instrument on the Solar Orbiter mission is designed to measure the magnetic field local to the spacecraft continuously for the entire mission duration. The need to characterise not only the background magnetic field but al…
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On-scalp MEG system utilizing an actively shielded array of optically-pumped magnetometers Open
The spatial resolution of magnetoencephalography (MEG) can be increased from that of conventional SQUID-based systems by employing on-scalp sensor arrays of e.g. optically-pumped magnetometers (OPMs). However, OPMs reach sufficient sensiti…
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Simultaneous Broadband Vector Magnetometry Using Solid-State Spins Open
We demonstrate a vector magnetometer that simultaneously measures all Cartesian components of a dynamic magnetic field using an ensemble of nitrogen-vacancy (NV) centers in a single-crystal diamond. Optical NV-diamond measurements provide …
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Ultrasensitive Magnetic Field Sensors for Biomedical Applications Open
The development of magnetic field sensors for biomedical applications primarily focuses on equivalent magnetic noise reduction or overall design improvement in order to make them smaller and cheaper while keeping the required values of a l…
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Studying the effect of Zn-substitution on the magnetic and hyperthermic properties of cobalt ferrite nanoparticles Open
The possibility to finely control nanostructured cubic ferrites (M(II)Fe2O4) paves the way to design materials with the desired magnetic properties for specific applications. However, the strict and complex interrelation among the chemical…
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Cavity optomechanical sensing Open
Cavity optomechanical systems enable interactions between light and mechanical resonators, providing a platform both for fundamental physics of macroscopic quantum systems and for practical applications of precision sensing. The resonant e…
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Biosensing Using Magnetic Particle Detection Techniques Open
Magnetic particles are widely used as signal labels in a variety of biological sensing applications, such as molecular detection and related strategies that rely on ligand-receptor binding. In this review, we explore the fundamental concep…
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Recording brain activities in unshielded Earth’s field with optically pumped atomic magnetometers Open
High-sensitivity total-field atomic magnetometer enables brain-activity measurements in unshielded Earth’s field.
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Bis-Monophospholyl Dysprosium Cation Showing Magnetic Hysteresis at 48 K Open
Single-molecule magnets (SMMs) have potential applications in high-density data storage, but magnetic relaxation times at elevated temperatures must be increased to make them practically useful. Bis-cyclopentadienyl lanthanide sandwich com…
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Quantum enhanced optomechanical magnetometry Open
The resonant enhancement of both mechanical and optical response in microcavity optomechanical devices allows exquisitely sensitive measurements of stimuli, such as acceleration, mass, and magnetic fields.In this work, we show that quantum…
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An Indoor Position-Estimation Algorithm Using Smartphone IMU Sensor Data Open
Position-estimation systems for indoor localization play an important role in everyday life. The global positioning system (GPS) is a popular positioning system, which is mainly efficient for outdoor environments. In indoor scenarios, GPS …
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Magnetometer Calibration Using Inertial Sensors Open
In this work we present a practical algorithm for calibrating a magnetometer\nfor the presence of magnetic disturbances and for magnetometer sensor errors.\nTo allow for combining the magnetometer measurements with inertial measurements\nf…
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Triaxial detection of the neuromagnetic field using optically-pumped magnetometry: feasibility and application in children Open
Optically-pumped magnetometers (OPMs) are an established alternative to superconducting sensors for magnetoencephalography (MEG), offering significant advantages including flexibility to accommodate any head size, uniform coverage, free mo…
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A microfabricated optically-pumped magnetic gradiometer Open
We report on the development of a microfabricated atomic magnetic gradiometer based on optical spectroscopy of alkali atoms in the vapor phase. The gradiometer, which operates in the spin-exchange relaxation free regime, has a length of 60…
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High-speed domain wall racetracks in a magnetic insulator Open
Recent reports of current-induced switching of ferrimagnetic oxides coupled to heavy metals have opened prospects for implementing magnetic insulators into electrically addressable devices. However, the configuration and dynamics of magnet…
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A New Model of the Crustal Magnetic Field of Mars Using MGS and MAVEN Open
While devoid of an active magnetic dynamo field today, Mars possesses a remanent magnetic field that may reach several thousand nanoteslas locally. The exact origin and the events that have shaped the crustal magnetization remain largely e…
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Fabrication of all diamond scanning probes for nanoscale magnetometry Open
The electronic spin of the nitrogen vacancy (NV) center in diamond forms an atomically sized, highly sensitive sensor for magnetic fields. To harness the full potential of individual NV centers for sensing with high sensitivity and nanosca…
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Theoretical advantages of a triaxial optically pumped magnetometer magnetoencephalography system Open
The optically pumped magnetometer (OPM) is a viable means to detect magnetic fields generated by human brain activity. Compared to conventional detectors (superconducting quantum interference devices) OPMs are small, lightweight, flexible,…
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Four-channel optically pumped atomic magnetometer for magnetoencephalography Open
We have developed a four-channel optically pumped atomic magnetometer for magnetoencephalography (MEG) that incorporates a passive diffractive optical element (DOE). The DOE allows us to achieve a long, 18-mm gradiometer baseline in a comp…
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Diamond magnetometer enhanced by ferrite flux concentrators Open
Magnetometers based on nitrogen-vacancy (NV) centers in diamond are promising room-temperature, solid-state sensors. However, their reported sensitivity to magnetic fields at low frequencies (≾1 kHz) is presently ≿10 pT s1/2, precluding po…
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Invited Review Article: Instrumentation for nuclear magnetic resonance in zero and ultralow magnetic field Open
We review experimental techniques in our laboratory for nuclear magnetic resonance (NMR) in zero and ultralow magnetic field (below 0.1 μT) where detection is based on a low-cost, non-cryogenic, spin-exchange relaxation free 87Rb atomic ma…