Detection of Low-Frequency Magnetic Fields Down to Sub-pT Resolution With Planar-Hall Effect Sensors
Proloy T. Das, Hariharan Nhalil, Moty Schultz, Shai Amrusi, Asaf Grosz, Lior Klein
Abstract
Using planar Hall effect sensors with magnetic flux concentrators, we measure magnetic fields at frequencies below 100 Hz. We show that for a measurement time of up to 100 s, it is possible to detect fields of ~700 fT and ~1 pT at 10 Hz and 0.1 Hz, respectively. In addition, we measure the linearity and hysteresis of the sensor for fields ≤2.6 μT. These features, combined with the sensor miniature size, low power consumption, and potential low cost, may pave the way for usage in a wide range of applications.
Topics & Concepts
Hall effect sensorPlanarMagnetic fieldLinearityLow frequencyHysteresisHall effectMeasure (data warehouse)Power consumptionRange (aeronautics)MagnetometerPhysicsDynamic rangeMagnetPower (physics)Resolution (logic)Materials scienceElectrical engineeringAcousticsOptoelectronicsOpticsCondensed matter physicsEngineeringComputer scienceAstronomyComputer graphics (images)Quantum mechanicsComposite materialArtificial intelligenceDatabaseMagnetic Field Sensors TechniquesAtomic and Subatomic Physics ResearchCharacterization and Applications of Magnetic Nanoparticles