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Measurement System for Short-Pulsed Magnetic Fields.

Voitech Stankevič1,2, Skirmantas Keršulis1, Justas Dilys1

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A new measurement system using colossal magnetoresistance (CMR) sensors accurately measures short, high-amplitude magnetic fields. Optimized manganite films minimize memory effects for reliable pulsed magnetic field detection.

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MOCVD technologycolossal magnetoresistancemagnetic field measurement systemmagnetic field sensorsnanostructured manganite filmspulsed magnetic fieldresistance relaxation processes

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Area of Science:

  • Materials Science
  • Physics
  • Electrical Engineering

Background:

  • Measuring short-duration, high-amplitude magnetic fields presents challenges due to sensor memory effects and parasitic signals.
  • Colossal magnetoresistance (CMR) sensors offer potential for high sensitivity magnetic field detection.

Purpose of the Study:

  • Develop a robust measurement system for short-pulsed magnetic fields using CMR-B-scalar sensors.
  • Investigate and mitigate the memory effect in manganite films for improved sensor performance.
  • Optimize sensor materials and system design for accurate magnetic field recording.

Main Methods:

  • Fabrication and characterization of nanostructured manganite (La1-xSrx(Mn1-yCoy)zO3) films with varying Co and Mn content.
  • Measurement of magnetoresistance (MR) and resistance relaxation in pulsed magnetic fields (up to 20 T) across a temperature range (80-365 K).
  • Design and implementation of a shielded measurement module with a bipolar-pulsed voltage supply, high-frequency generator, 16-bit ADC, and fiber optic data transmission.

Main Results:

  • Co-doped LSMCO films exhibit minimized magnetic memory effects at low temperatures, suitable for such applications.
  • Mn-rich LSMO films show no magnetic memory effects and higher MR values at temperatures above room temperature.
  • The developed system successfully measured magnetic fields with pulse durations from 3 to 20 μs, demonstrating high accuracy and reliability.

Conclusions:

  • The developed CMR-based measurement system is effective for accurately measuring high-pulsed magnetic fields in the microsecond range.
  • Material selection (Co-doped LSMCO or Mn-rich LSMO) is crucial for optimizing sensor performance based on operating temperature.
  • The system's design, including bipolar voltage supply and electromagnetic shielding, effectively addresses parasitic signals and noise for reliable measurements.