Micromagnetic simulations of first-order reversal curve (FORC) diagrams of framboidal greigite
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Greigite is a sensitive environmental indicator and occurs commonly in nature as magnetostatically interacting framboids. Until now only the magnetic response of isolated non-interacting greigite particles have been modelled micromagnetically. We present here hysteresis and first-order reversal curve (FORC) simulations for framboidal greigite (Fe3S4), and compare results to those for isolated particles of a similar size. We demonstrate that these magnetostatic interactions alter significantly the framboid FORC response compared to isolated particles, which makes the magnetic response similar to that of much larger (multidomain) grains. We also demonstrate that framboidal signals plot in different regions of a FORC diagram, which facilitates differentiation between framboidal and isolated grain signals. Given that large greigite crystals are rarely observed in microscopy studies of natural samples, we suggest that identification of multidomain-like FORC signals in samples known to contain abundant greigite could be interpreted as evidence for framboidal greigite.
Date Issued
2020-05-18
Date Acceptance
2020-05-12
Citation
Geophysical Journal International, 2020, 222 (2), pp.1126-1134
ISSN
0956-540X
Publisher
Oxford University Press (OUP)
Start Page
1126
End Page
1134
Journal / Book Title
Geophysical Journal International
Volume
222
Issue
2
Copyright Statement
© The Author(s) 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society.
This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). This is a pre-copy-editing, author-produced version of an article accepted for publication in Geophysical Journal International following peer review. The definitive publisher-authenticated version Miguel A Valdez-Grijalva, Lesleis Nagy, Adrian R Muxworthy, Wyn Williams, Andrew P Roberts, David Heslop, Micromagnetic simulations of first-order reversal curve (FORC) diagrams of framboidal greigite, Geophysical Journal International, Volume 222, Issue 2, 1 August 2020, Pages 1126–1134 is available online at: https://doi.org/10.1093/gji/ggaa241
This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). This is a pre-copy-editing, author-produced version of an article accepted for publication in Geophysical Journal International following peer review. The definitive publisher-authenticated version Miguel A Valdez-Grijalva, Lesleis Nagy, Adrian R Muxworthy, Wyn Williams, Andrew P Roberts, David Heslop, Micromagnetic simulations of first-order reversal curve (FORC) diagrams of framboidal greigite, Geophysical Journal International, Volume 222, Issue 2, 1 August 2020, Pages 1126–1134 is available online at: https://doi.org/10.1093/gji/ggaa241
Identifier
https://academic.oup.com/gji/article/222/2/1126/5838748
Subjects
0403 Geology
0404 Geophysics
0909 Geomatic Engineering
Geochemistry & Geophysics
Publication Status
Published
Date Publish Online
2020-05-18