ORCID Profile
0000-0002-3070-4477
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Publisher: Oxford University Press (OUP)
Date: 18-05-2020
DOI: 10.1093/GJI/GGAA241
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 s les, we suggest that identification of multidomain-like FORC signals in s les known to contain abundant greigite could be interpreted as evidence for framboidal greigite.
Publisher: American Geophysical Union (AGU)
Date: 12-2017
DOI: 10.1002/2017JB014860
Publisher: Elsevier BV
Date: 08-2008
Publisher: American Geophysical Union (AGU)
Date: 06-2018
DOI: 10.1029/2018JB015706
Publisher: American Geophysical Union (AGU)
Date: 08-04-2011
DOI: 10.1029/2010JB007844
Publisher: Elsevier BV
Date: 10-2012
Publisher: American Geophysical Union (AGU)
Date: 26-03-2010
DOI: 10.1029/2009JB006475
Publisher: American Geophysical Union (AGU)
Date: 17-02-2009
DOI: 10.1029/2008JB006017
Publisher: American Geophysical Union (AGU)
Date: 2005
DOI: 10.1029/2004JB003195
Publisher: American Geophysical Union (AGU)
Date: 12-2021
DOI: 10.1029/2021JB023027
Abstract: Hematite carries magnetic signals of interest in tectonic, paleoclimatic, paleomagnetic, and planetary studies. First‐order reversal curve (FORC) diagrams have become an important tool for assessing the domain state of, and magnetostatic interactions among, magnetic particles in such studies. We present here FORC diagrams for erse hematite s les, which provide a catalog for comparison with other studies and explain key features observed for hematite. Ridge‐type signatures typical of uniaxial single‐domain particle assemblages and “kidney‐shaped” FORC signatures, and combinations of these responses, occur commonly in natural and synthetic hematite. Asymmetric features that arise from the triaxial basal plane anisotropy of hematite contribute to vertical spreading in kidney‐shaped FORC distributions and are intrinsic responses even for magnetostatically noninteracting particles. The dominant FORC distribution type in a s le (ridge, kidney‐shaped, or mixture) depends on the balance between uniaxial/triaxial switching. The identified signals explain magnetization switching and anisotropy features that are intrinsic to the magnetic properties of hematite and other materials with multiaxial magnetic anisotropy.
Publisher: Elsevier BV
Date: 08-2011
Publisher: Oxford University Press (OUP)
Date: 15-07-2004
Publisher: Elsevier BV
Date: 11-2022
Publisher: American Geophysical Union (AGU)
Date: 08-04-2011
DOI: 10.1029/2010JB007843
Publisher: American Geophysical Union (AGU)
Date: 07-2010
DOI: 10.1029/2010GC003071
Publisher: American Geophysical Union (AGU)
Date: 13-06-2008
DOI: 10.1029/2007JB005502
Publisher: Elsevier BV
Date: 03-2005
Publisher: American Geophysical Union (AGU)
Date: 05-2018
DOI: 10.1029/2018GC007511
Publisher: American Geophysical Union (AGU)
Date: 06-2019
DOI: 10.1029/2018JB017049
Publisher: American Geophysical Union (AGU)
Date: 21-12-2007
DOI: 10.1029/2007GL032114
Publisher: Springer Science and Business Media LLC
Date: 19-11-2009
Publisher: American Geophysical Union (AGU)
Date: 12-2013
DOI: 10.1002/2013GC004973
Location: United Kingdom of Great Britain and Northern Ireland
Location: Germany
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: Germany
No related grants have been discovered for Adrian Muxworthy.