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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

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Single Particle Multipole Expansions From Micromagnetic Tomography.

David Cortés-Ortuño¹, Karl Fabian², Lennart V de Groot¹

¹Paleomagnetic Laboratory Fort Hoofddijk Department of Earth Sciences Utrecht University Utrecht The Netherlands.

Geochemistry, Geophysics, Geosystems : G(3)

|July 5, 2021

Summary

This study introduces a new mathematical method for micromagnetic tomography, enhancing the analysis of individual magnetic particle magnetization. The technique recovers higher-order magnetic potential details, offering deeper insights into rock magnetic properties and paleomagnetic reliability.

Keywords:

magnetism micromagnetic tomography multipole paleomagnetism rock magnetism

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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

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Area of Science:

Geophysics
Materials Science
Paleomagnetism

Background:

Micromagnetic tomography combines magnetic scanning with micro X-ray computed tomography (microCT) to study individual magnetic particles.
Previous methods could robustly infer dipole moments but lacked detailed magnetization information.
Understanding individual particle magnetization is crucial for rock magnetic studies and paleomagnetism.

Purpose of the Study:

To develop a mathematical procedure for recovering higher-order magnetic potential components of individual magnetic particles.
To apply spherical harmonic expansions (SHE) for detailed magnetic analysis.
To enhance micromagnetic tomography for advanced rock magnetic investigations.

Main Methods:

Utilized scanning superconducting quantum interference device (SQUID) microscopy and microCT data.
Developed a mathematical procedure to calculate spherical harmonic expansions (SHE) of magnetic potential.
Tested the method on a reference sample with multiple magnetic particles.

Main Results:

Successfully recovered SHE up to order n=3 for particles with high signal-to-noise ratios.
Demonstrated that higher-order SHE provide constraints on internal magnetization structures.
Validated the robustness of the SHE recovery method.

Conclusions:

The enhanced micromagnetic tomography approach provides detailed rock magnetic information.
This method improves the assessment of particle stability and reliability as paleomagnetic remanence carriers.
Enables new avenues for studying large ensembles of magnetic particles with unprecedented detail.