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A Pulse EPR 25 mT magnetometer with 10ppm resolution.

Subramanian V Sundramoorthy1, Boris Epel1, Howard J Halpern1

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A new magnetometer accurately measures magnetic fields up to 25 mT for permanent magnet manufacturing. It utilizes pulsed electron paramagnetic resonance (EPR) for reliable measurements even in challenging magnetic field conditions.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physics

Background:

  • Accurate magnetic field measurement is crucial for permanent magnet manufacturing.
  • Traditional magnetometers can struggle with the inhomogeneous fields often found in un-shimmed magnets.

Purpose of the Study:

  • To describe a novel magnetometer designed for permanent magnet manufacturing.
  • To achieve high absolute accuracy (10 ppm) at typical operating fields (around 25 mT).

Main Methods:

  • The study details a magnetometer employing pulsed electron paramagnetic resonance (EPR).
  • Pulsed broadband acquisition techniques were utilized for data collection.

Main Results:

  • The developed magnetometer operates reliably around 25 mT with 10 ppm absolute accuracy.
  • The pulsed acquisition method enabled accurate measurements despite magnetic field gradients and inhomogeneities.

Conclusions:

  • The described pulsed EPR magnetometer is suitable for quality control in permanent magnet production.
  • This technology offers robust magnetic field characterization in challenging manufacturing environments.