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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Angular Position Sensor Based on Anisotropic Magnetoresistive and Anomalous Nernst Effect.

Jiaqi Wang1, Hang Xie1, Yihong Wu1,2

  • 1Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore.

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Summary
This summary is machine-generated.

This study introduces a novel magnetic position sensor capable of 0-360° angle detection. By combining anisotropic magnetoresistance (AMR) and anomalous Nernst effect (ANE) signals, it overcomes previous limitations in wide field range measurements.

Keywords:
anisotropic magnetoresistanceanomalous Nernst effectharmonic measurementmagnetic position sensor

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Magnetic position sensors are crucial for industrial and consumer applications.
  • Accurate 0-360° angle measurement across wide magnetic fields using a single sensor is challenging.

Purpose of the Study:

  • To develop a single-sensor solution for full-range angle detection.
  • To leverage anisotropic magnetoresistance (AMR) and anomalous Nernst effect (ANE) for enhanced performance.

Main Methods:

  • A novel magnetic position sensor utilizing a single Wheatstone bridge structure from a ferromagnetic layer.
  • Concurrent measurement of AMR signals from the bridge and ANE signals from transverse ports.

Main Results:

  • Successful demonstration of 0-360° angle detection with a single sensor.
  • Achieved a mean angle error between 0.51° and 1.05° across a wide field range (100 Oe-10,000 Oe).

Conclusions:

  • The combined AMR and ANE approach enables robust, full-range angle sensing.
  • This technology offers a promising solution for advanced magnetic position sensing applications.