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Related Concept Videos

The Hall Effect01:30

The Hall Effect

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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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Magnetic Damping01:17

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Paramagnetism01:30

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Galvanometer01:25

Galvanometer

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Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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Magnetism01:30

Magnetism

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Precision Hall Effect magnetometer.

A I Rokeakh1, M Yu Artyomov1

  • 1Ural Federal University, Institute of Natural Sciences and Mathematics, 19 Mira Street, 620002 Ekaterinburg, Russia.

The Review of Scientific Instruments
|April 4, 2023
PubMed
Summary
This summary is machine-generated.

A new Hall effect magnetometer offers high accuracy and stability for Electron Paramagnetic Resonance (EPR) spectroscopy. Digital signal processing and calibration ensure precise magnetic field measurements in a compact, cost-effective design.

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Area of Science:

  • Instrumentation and Measurement Science
  • Spectroscopy
  • Applied Physics

Background:

  • Electron Paramagnetic Resonance (EPR) spectroscopy requires precise magnetic field measurements for accurate analysis.
  • Existing magnetometers may face limitations in size, cost, accuracy, or long-term stability for desktop EPR systems.
  • Integration of advanced digital signal processing is crucial for enhancing magnetometer performance.

Purpose of the Study:

  • To develop and present a high-accuracy, stable, and cost-effective Hall effect magnetometer.
  • To enable its application within a desktop Electron Paramagnetic Resonance (EPR) spectrometer.
  • To achieve superior performance through advanced digital signal processing and calibration techniques.

Main Methods:

  • Utilized a Hall effect sensor with an alternating-sign square wave exciting current generated by a high-speed H-bridge.
  • Implemented digital signal processing, including sequential time and frequency domain filtering, and digital data correction.
  • Employed Xilinx Field-Programmable Gate Array (FPGA) Artix-7 for control signal generation and data acquisition, with a MicroBlaze processor for system management.
  • Applied individual sensor calibration using polynomial correction based on field induction and temperature, storing coefficients in EEPROM.

Main Results:

  • Achieved high accuracy and long-term stability in a compact and low-cost magnetometer design.
  • Demonstrated a magnetometer resolution of 0.1 µT.
  • Ensured an absolute measurement error not exceeding 6 µT.
  • Successfully compensated for sensor offset voltage, magnetic sensitivity nonlinearity, and temperature dependencies.

Conclusions:

  • The developed Hall effect magnetometer meets the stringent requirements for desktop EPR spectrometers.
  • Digital signal processing and individual calibration significantly enhance measurement accuracy and stability.
  • The design offers a practical solution for precise magnetic field monitoring in spectroscopic applications.