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The magnetic structure and palaeomagnetic recording fidelity of sub-micron greigite (Fe3S4)

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Title: The magnetic structure and palaeomagnetic recording fidelity of sub-micron greigite (Fe3S4)
Authors: Valdez-Grijalva, MA
Nagy, L
Muxworthy, AR
Williams, W
Fabian, K
Item Type: Journal Article
Abstract: We present the results of a finite-element micromagnetic model of View the MathML source to View the MathML source greigite (Fe3S4) grains with a variety of equant morphologies. This grain size range covers the magnetic single-domain (SD) to pseudo single-domain (PSD) transition, and possibly also the PSD to multi-domain (MD) transition. The SD–PSD threshold d0 is determined to be View the MathML source depending on grain shape. The nudged elastic-band method was used to determine the room temperature energy barriers between stable states and thus the blocking volumes. It is found that, in the absence of interparticle magnetostatic interactions, the magnetisation of equant SD greigite is not stable on a geological scale and only PSD grains View the MathML source can be expected to carry a stable magnetisation over billion-year timescales, i.e., all non-interacting SD particles are essentially superparamagnetic. We further identify a mechanism for the PSD to multi-domain (MD) transition, which is of a continuous nature from PSD nucleation up to View the MathML source, when structures typical of MD behaviour like closure domains begin to form.
Issue Date: 15-Dec-2017
Date of Acceptance: 4-Dec-2017
URI: http://hdl.handle.net/10044/1/54489
DOI: https://dx.doi.org/10.1016/j.epsl.2017.12.015
ISSN: 0012-821X
Publisher: Elsevier
Start Page: 76
End Page: 89
Journal / Book Title: Earth and Planetary Science Letters
Volume: 483
Copyright Statement: © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Sponsor/Funder: Natural Environment Research Council (NERC)
Funder's Grant Number: NE/J020508/1
Keywords: 02 Physical Sciences
04 Earth Sciences
Geochemistry & Geophysics
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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