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Low-temperature magnetic properties of greigite (Fe3S4)

Record type: Article

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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Citation

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).

More information

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

Identifiers

Local EPrints ID: 68610
URI: http://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 2017 00:17

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Contributors

Author: Liao Chang
Author: Andrew P. Roberts
Author: Christopher J. Rowan
Author: Yan Tang
Author: Petr Pruner
Author: Qianwang Chen
Author: Chorng-Shern Horng

University divisions


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