Micromagnetic Calculations of the Domain Structure of Submicron- and Micron-Sized Magnetite Grains

V. P. Shcherbakov; Щербаков В. П.; N. K. Sycheva; Сычева Н. К.

doi:10.31857/S0002333723020126

Micromagnetic Calculations of the Domain Structure of Submicron- and Micron-Sized Magnetite Grains

Authors: Shcherbakov V.P.¹, Sycheva N.K.¹
Affiliations:
1. Borok Geophysical Observatory of Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences
Issue: No 2 (2023)
Pages: 193-211
Section: Articles
URL: https://journals.rcsi.science/0002-3337/article/view/139008
DOI: https://doi.org/10.31857/S0002333723020126
EDN: https://elibrary.ru/LJHMZT
ID: 139008

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Abstract
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Abstract

The evolution of the domain structure (DS) of cubic submicron- and micron-sized magnetite particles has been studied in detail during “cooling” of specimens from the Curie temperature Т_с to room temperature Т_r followed by their “reheating” to Т_с in order to determine the degree of irreversibility of DS changes during heat treatment and their possible effects on the thermoremanent magnetization (TRM) properties. It is shown that typical magnetic configurations in particles up to 2 μm in size have flower or vortex shapes with one or two vortices. A model of the formation of thermoremanent magnetization (TRM) in submicron-sized pseudo-single-domain particles (PSD) is proposed based on an expansion of Neel’s single-domain thermofluctuation model of TRM acquisition. According to the model, the equality of blocking and deblocking temperatures is retained for submicron PSD grains. Consequently, for this magnetic fraction, the Thellier laws of pTRM additivity and independence must also be valid.

Keywords

rock magnetism, domain structure, micromagnetic modeling, temperature hysteresis, magnetic configuration, thermoremanent magnetization

About the authors

V. P. Shcherbakov

Borok Geophysical Observatory of Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences

Author for correspondence.
Email: shcherbakovv@list.ru
152742 Russia, Yaroslavl Region, Borok

N. K. Sycheva

Borok Geophysical Observatory of Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences

Author for correspondence.
Email: sycheva@borok.yar.ru
152742 Russia, Yaroslavl Region, Borok

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