MagNetZ With Elias Mansbach (2023/04/12) - Micromagnetic Modeling of Domain States in Tetrataenite
Channel: MagNetZ
Date: 2023-04-12

Micromagnetic Modeling of Domain States in Tetrataenite

The video is also available for download at: https://earthref.org/ERDA/2562/
and can be referenced with the doi: 10.7288/V4/ERDA/2562

Title: Micromagnetic Modeling of Domain States in Tetrataenite
Author: Elias Mansbach from Massachusetts Institute of Technology, USA

Paleomagnetic studies of meteorites provide unique constraints on the evolution of magnetic fields in the early solar system. These studies rely on the identification of magnetic minerals that can retain stable magnetizations over ≳4.5 billion years (Ga). The ferromagnetic mineral tetrataenite (γ''-Fe0.5Ni0.5) is found in iron, stony-iron and chondrite meteorite groups. Nanoscale intergrowths of tetrataenite have been shown to carry records of paleomagnetic fields, although the effect of magnetostatic interactions on their magnetic remanence acquisition remains to be fully understood. Tetrataenite can also occur as isolated, non-interacting, nanoscale grains in many meteorite groups, although the paleomagnetic potential of these grains is particularly poorly understood. In this talk, I will discuss analytical calculations and micromagnetic modeling of individual tetrataenite grain domain states as a way to improve our understanding of tetrataenite magnetization and to refine our knowledge of existing paleomagnetic analyses. Our results provide deeper insight into the importance of magnetostatic interactions in previous tetrataenite studies and what makes this mineral such an interesting and useful paleomagnetic recorder.

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00:00 - Intro
01:16 - Presentation
26:20 - Questions
35:18 - Announcements