Scanning Magnetic Microscope Using a Gradiometric Configuration for Characterization of Rock Samples

Area of Science:

• Geophysics
• Materials Science
• Analytical Chemistry

Background:

• Scanning magnetic microscopy offers high spatial resolution and field sensitivity for magnetic field mapping.
• Unlike other methods, it operates without cryogenic technology, reducing cost and complexity.
• Accurate processing of magnetic microscopy data is crucial for detailed sample analysis.

Purpose of the Study:

• To present a novel spatial domain technique for processing magnetic microscopy data.
• To estimate magnetic moment distribution using an equivalent layer approach.
• To enable detailed magnetic interpretation of samples with high spatial variability.

Main Methods:

• Developed a spatial domain technique based on an equivalent layer approach.
• Formulated a linear inverse problem to calculate magnetic vector and amplitude.
• Applied the method to process data from magnetic microscopy.

Main Results:

• The technique effectively estimates magnetic moment distribution over a fictitious dipole layer.
• Generated vector field maps provide comprehensive information on magnetic carrier distribution.
• The approach allows for characterization of isolated areas and bulk samples at micro/millimeter scales.

Conclusions:

• The presented technique enhances magnetic microscopy data analysis.
• It provides valuable insights into spatial magnetization distribution, particularly for samples with high variability.
• This method is applicable to various fields, including rock magnetism, requiring room-temperature mapping.