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Design and implementation of a low temperature, inductance based high frequency alternating current susceptometer.

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We developed a new AC susceptometer for low-temperature, high-frequency magnetic measurements. This instrument achieves high sensitivity, enabling detailed studies of magnetic materials like spin ice and nanoparticles.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • AC susceptibility is a key technique for probing magnetic properties.
  • Low-temperature and high-frequency measurements are crucial for understanding complex magnetic phenomena.

Purpose of the Study:

  • To report the implementation of a novel induction-based AC susceptometer.
  • To detail its capabilities for low-temperature (2-300 K) and high-frequency (up to 3.5 MHz) measurements.
  • To demonstrate its high sensitivity for magnetic moment resolution.

Main Methods:

  • Induction-based AC susceptometer design with careful coil balancing.
  • Calibration procedures for accurate measurements.
  • Variable temperature control from 2 K to 300 K.
  • High-frequency measurements up to 3.5 MHz.

Main Results:

  • Achieved a sample magnetic moment resolution of 5 × 10-10 Am2 at 1 MHz.
  • Successfully characterized the susceptometer's performance.
  • Demonstrated functionality through measurements on spin ice (CdEr2S4) and iron oxide nanoparticles.

Conclusions:

  • The developed AC susceptometer is a versatile tool for advanced magnetic characterization.
  • Its high sensitivity and wide operating range facilitate the study of novel magnetic materials.
  • The instrument is suitable for investigating spin ice systems and magnetic nanoparticles.