Micromagnetic simulations of first-order reversal curve (FORC) diagrams of framboidal greigite

Miguel A. Valdez-Grijalva, Lesleis Nagy, Adrian R. Muxworthy*, Wyn Williams, Andrew P. Roberts, David Heslop

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)1126-1134
    Number of pages9
    JournalGeophysical Journal International
    Volume222
    Issue number2
    DOIs
    Publication statusPublished - 13 May 2020

    Fingerprint

    Dive into the research topics of 'Micromagnetic simulations of first-order reversal curve (FORC) diagrams of framboidal greigite'. Together they form a unique fingerprint.

    Cite this