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Mapping Magnetic Signals of Individual Magnetite Grains to Their Internal Magnetic Configurations Using Micromagnetic

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

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

Journal of Geophysical Research. Solid Earth
|July 22, 2022
PubMed
Summary

Micromagnetic tomography (MMT) uniquely determines a grain's magnetic configuration by analyzing its multipole moments. This allows for the identification of stable paleomagnetic recorders within natural samples.

Keywords:
micromagnetic tomographymicromagneticsmineral magnetismmultipolesrock magnetism

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Area of Science:

  • Geophysics
  • Materials Science
  • Paleomagnetism

Background:

  • Micromagnetic tomography (MMT) integrates X-ray micro computed tomography and scanning magnetometry.
  • MMT recovers magnetic signals from individual grains, crucial for paleomagnetic studies of the ancient geomagnetic field.
  • Studying remanent magnetization in geological samples relies on understanding individual grain magnetism.

Purpose of the Study:

  • To demonstrate that MMT can uniquely infer the internal magnetization structure of individual magnetic grains.
  • To explore the capability of MMT in discriminating between different magnetic configurations (single-domain, multi-domain, vortex states).
  • To establish MMT as a tool for selecting magnetic grains based on their magnetization states for paleomagnetic applications.

Main Methods:

  • Numerical inversion of surface magnetic measurements using spherical harmonic expansions.
  • Application of a three-dimensional micromagnetic model to predict multipole signals.
  • Analysis of magnetic potential, including higher-order multipole moments, particle shape, and mineral properties.

Main Results:

  • MMT can uniquely determine the magnetic potential of individual grains, beyond simple dipole approximations.
  • Complex magnetic information, combined with physical properties, constrains the internal magnetization structure.
  • It is possible to uniquely infer the magnetic configuration (e.g., single-domain, multi-domain, vortex) from inverted magnetic multipole moments for certain grains.

Conclusions:

  • MMT provides a powerful method to characterize the magnetization states of individual magnetic grains.
  • This capability enables the selection of statistical ensembles of magnetic grains based on their magnetization.
  • MMT opens new avenues for identifying and characterizing stable paleomagnetic recorders in natural samples.