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Characterizing Complex Mineral Structures in Thin Sections of Geological Samples with a Scanning Hall Effect

Jefferson F D F Araujo1, Andre L A Reis2, Vanderlei C Oliveira3

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We enhanced a magnetic scanning microscope for detailed mineral analysis in geological samples. This improved system offers submillimeter resolution and high sensitivity for magnetic property measurements.

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Area of Science:

  • Geophysics
  • Materials Science
  • Mineralogy

Background:

  • Accurate measurement of magnetic properties in geological samples is crucial for understanding Earth's processes.
  • Existing techniques may lack the spatial resolution or sensitivity required for detailed mineral analysis.

Purpose of the Study:

  • To develop and validate an improved magnetic scanning microscope for submillimeter-scale analysis of mineral magnetic properties.
  • To enhance spatial resolution and sensitivity for geological sample characterization.

Main Methods:

  • Utilized a 200 µm Hall sensor positioned 142 µm from the sample.
  • Incorporated a gradiometric Hall sensor configuration to minimize background noise and electromagnet interference.
  • Employed a custom electronics system and a scanning XY stage for precise sample positioning and measurement.
  • Applied an alternative model considering sample geometry for magnetization analysis.

Main Results:

  • Achieved a spatial resolution of 200 µm with a noise level of 300 nTrms/(Hz)1/2 at 6.0 Hz in an unshielded environment.
  • Demonstrated a magnetic moment sensitivity of 1.3 × 10-11 Am².
  • Successfully measured representative magnetization and identified micrometric characteristics in a geological sample slice.

Conclusions:

  • The improved magnetic scanning microscope provides high-resolution and sensitive measurements of mineral magnetic properties.
  • The system is effective for characterizing geological samples at the submillimeter scale.
  • The developed methodology enables detailed analysis of magnetic features within mineral samples.