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Low-temperature magnetic properties of greigite (Fe3S4)

Low-temperature magnetic properties of greigite (Fe3S4)
Low-temperature magnetic properties of greigite (Fe3S4)
We provide comprehensive low-temperature magnetic results for greigite (Fe3S4) across the spectrum from superparamagnetic (SP) to multi-domain (MD) behavior. It is well known that greigite has no low-temperature magnetic transitions, but we also document that it has strong domain-state dependence of magnetic properties at low temperatures. Blocking of SP grains and increasing thermal stability with decreasing temperature is apparent in many magnetic measurements. Thermally stable single-domain greigite undergoes little change in magnetic properties below room temperature. For pseudo-single-domain (PSD)/MD greigite, hysteresis properties and first-order reversal curve diagrams exhibit minor changes at low temperatures, while remanence continuously demagnetizes because of progressive domain wall unpinning. The low-temperature demagnetization is grain size dependent for PSD/MD greigite, with coarser grains undergoing larger remanence loss. AC susceptibility measurements indicate consistent blocking temperatures (TB) for all synthetic and natural greigite samples, which are probably associated with surficial oxidation. Low-temperature magnetic analysis provides much more information about magnetic mineralogy and domain state than room-temperature measurements and enables discrimination of individual components within mixed magnetic mineral assemblages. Low-temperature rock magnetometry is therefore a useful tool for studying magnetic mineralogy and granulometry of greigite-bearing sediments.
greigite, magnetic properties
1525-2027
Q01Y04
Chang, Liao
83123f49-dd71-43a9-a0b1-d80777231b44
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f
Rowan, Christopher J.
c90b0a90-bdeb-4485-81dc-af73e5501165
Tang, Yan
c187bb9c-4a92-4492-8ebe-21c55cd47209
Pruner, Petr
129e7091-8754-4f1f-9aa8-c72508011419
Chen, Qianwang
b6cc3296-8996-4147-9f0c-963f0e432b63
Horng, Chorng-Shern
3d0d9429-844f-4f37-9a02-ccd2be8df121
Chang, Liao
83123f49-dd71-43a9-a0b1-d80777231b44
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f
Rowan, Christopher J.
c90b0a90-bdeb-4485-81dc-af73e5501165
Tang, Yan
c187bb9c-4a92-4492-8ebe-21c55cd47209
Pruner, Petr
129e7091-8754-4f1f-9aa8-c72508011419
Chen, Qianwang
b6cc3296-8996-4147-9f0c-963f0e432b63
Horng, Chorng-Shern
3d0d9429-844f-4f37-9a02-ccd2be8df121

Chang, Liao, Roberts, Andrew P., Rowan, Christopher J., Tang, Yan, Pruner, Petr, Chen, Qianwang and Horng, Chorng-Shern (2009) Low-temperature magnetic properties of greigite (Fe3S4). Geochemistry, Geophysics, Geosystems, 10 (1), Q01Y04. (doi:10.1029/2008GC002276).

Record type: Article

Abstract

We provide comprehensive low-temperature magnetic results for greigite (Fe3S4) across the spectrum from superparamagnetic (SP) to multi-domain (MD) behavior. It is well known that greigite has no low-temperature magnetic transitions, but we also document that it has strong domain-state dependence of magnetic properties at low temperatures. Blocking of SP grains and increasing thermal stability with decreasing temperature is apparent in many magnetic measurements. Thermally stable single-domain greigite undergoes little change in magnetic properties below room temperature. For pseudo-single-domain (PSD)/MD greigite, hysteresis properties and first-order reversal curve diagrams exhibit minor changes at low temperatures, while remanence continuously demagnetizes because of progressive domain wall unpinning. The low-temperature demagnetization is grain size dependent for PSD/MD greigite, with coarser grains undergoing larger remanence loss. AC susceptibility measurements indicate consistent blocking temperatures (TB) for all synthetic and natural greigite samples, which are probably associated with surficial oxidation. Low-temperature magnetic analysis provides much more information about magnetic mineralogy and domain state than room-temperature measurements and enables discrimination of individual components within mixed magnetic mineral assemblages. Low-temperature rock magnetometry is therefore a useful tool for studying magnetic mineralogy and granulometry of greigite-bearing sediments.

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More information

Published date: 29 January 2009
Keywords: greigite, magnetic properties

Identifiers

Local EPrints ID: 68610
URI: https://eprints.soton.ac.uk/id/eprint/68610
ISSN: 1525-2027
PURE UUID: b1923d85-3853-4464-ba52-a8318e2b5ecf

Catalogue record

Date deposited: 03 Sep 2009
Last modified: 19 Jul 2019 23:49

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