Exploring micromagnetic modelling of highly-detailed three-dimensional finite element meshes: a new pathway to study the properties of remanence carriers in remagnetized carbonates

• Grant number: 22/14100-6
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: March 30, 2023
• End date: March 29, 2024
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geophysics
• Principal Investigator: Ricardo Ivan Ferreira da Trindade
• Grantee: Ualisson Donardelli Bellon
• Supervisor: Wyn Williams
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: University of Edinburgh, Scotland
• Associated to the scholarship: 21/00861-2 - Acquisition and chemical remagnetization in carbonates: an evaluation by micromagnetic modeling, laboratory simulations and case studies, BP.DR

Abstract

Although studied from different perspectives, the phenomena responsible for the growth of magnetic particles and acquiring of chemical remanent magnetization (CRM) is not fully understood. Remagnetized carbonate bear exquisite magnetic properties and contradictory domain tests that are still an unsolved scientific problem. Part of the problem relies on the fact that rock magnetism experiments provide information of bulk macroscopic samples, which are the result of a whole assemblage of magnetic grains. Synchrotron sourced X-ray Ptychographic nano-tomography (PnT) might offer compositional and structural information of particle of a few dozens of nanometers with incomparable resolution. In this BEPE proposal, we aim to use supercomputers in the University of Edinburgh to process PnT data acquired in the Brazilian Synchrotron Particle Accelerator (SIRIUS) of different sets of Neoproterozoic carbonate rocks, to obtain data from stable nanomagnetic particles. With the three-dimensional spatial distribution of these particles, micromagnetic calculations will be performed to individually model their behavior under a set of conditions. PnT data and micromagnetic modelling might provide information on the influence of magnetocrystalline/shape-anisotropy in remagnetized carbonates, while investigating morphology and composition of the remanence carriers on rocks will help to constrain the geological processes related to their formation and to better understand their magnetic properties, by providing a new in-situ non-destructive approach. This BEPE proposal is related to the FAPESP PhD-scholarship (21/00861-2) and to the FAPESP thematic project 16/06114-6. (AU)