The University of Southampton
University of Southampton Institutional Repository

Experimental comparison of FORC and remanent preisach diagrams

Experimental comparison of FORC and remanent preisach diagrams
Experimental comparison of FORC and remanent preisach diagrams
First-order reversal curve (FORC) and remanence-based Preisach diagrams are alternative ways of determining the Preisach distribution of a sample, which incorporates information about the coercivity spectrum and the distribution of interactions and self-demagnetizing fields. We compare results of the two methods for well-characterized synthetic and natural samples containing single-domain (SD) and pseudo-SD (PSD) magnetite, maghemite, titanomagnetite and titanomaghemite. The greater time requirements of remanence as opposed to in-field measurements limited our Preisach diagrams to a few hundred points, compared to several thousand points for the corresponding FORC diagrams. Only minimal smoothing could be applied in order to limit the regions near the axes of the diagrams in which function values must be extrapolated. In spite of these restrictions, we find excellent agreement between the essential features of the distributions determined by the two methods. The main features, the location and spreading of the distribution peak, are very consistent. However, the low-coercivity part of the Preisach distribution is sometimes poorly resolved or not imaged at all for remanence-only measurements. Features in this region can be diagnostic of PSD and multidomain (MD) grains. The essential agreement between our FORC and Preisach diagrams in the region where they overlap justifies using the much faster FORC routine instead of traditional remanence-based Preisach methods to determine the Preisach distribution of palaeomagnetic samples without strong interactions. We propose a symmetric FORC protocol that would permit separation of the irreversible and reversible parts of the Preisach distribution. The irreversible part is what is determined by remanence-only methods and what is desired for characterization of the remanence behaviour of palaeomagnetic samples. The reversible part is most significant in detecting MD behaviour and screening out samples containing large PSD and MD grains.
0956-540X
747-754
Carvallo, C.
d626c1b8-9a3e-4140-b2cd-c9728e289ad0
Dunlop, D.J.
04e18935-8b11-4e44-97d6-7c483d21ef5d
Ozdemir, O.
a80579ed-3d3e-48d7-aa99-df852d00a5b6
Carvallo, C.
d626c1b8-9a3e-4140-b2cd-c9728e289ad0
Dunlop, D.J.
04e18935-8b11-4e44-97d6-7c483d21ef5d
Ozdemir, O.
a80579ed-3d3e-48d7-aa99-df852d00a5b6

Carvallo, C., Dunlop, D.J. and Ozdemir, O. (2005) Experimental comparison of FORC and remanent preisach diagrams. Geophysical Journal International, 162 (3), 747-754. (doi:10.1111/j.1365-246X.2005.02688.x).

Record type: Article

Abstract

First-order reversal curve (FORC) and remanence-based Preisach diagrams are alternative ways of determining the Preisach distribution of a sample, which incorporates information about the coercivity spectrum and the distribution of interactions and self-demagnetizing fields. We compare results of the two methods for well-characterized synthetic and natural samples containing single-domain (SD) and pseudo-SD (PSD) magnetite, maghemite, titanomagnetite and titanomaghemite. The greater time requirements of remanence as opposed to in-field measurements limited our Preisach diagrams to a few hundred points, compared to several thousand points for the corresponding FORC diagrams. Only minimal smoothing could be applied in order to limit the regions near the axes of the diagrams in which function values must be extrapolated. In spite of these restrictions, we find excellent agreement between the essential features of the distributions determined by the two methods. The main features, the location and spreading of the distribution peak, are very consistent. However, the low-coercivity part of the Preisach distribution is sometimes poorly resolved or not imaged at all for remanence-only measurements. Features in this region can be diagnostic of PSD and multidomain (MD) grains. The essential agreement between our FORC and Preisach diagrams in the region where they overlap justifies using the much faster FORC routine instead of traditional remanence-based Preisach methods to determine the Preisach distribution of palaeomagnetic samples without strong interactions. We propose a symmetric FORC protocol that would permit separation of the irreversible and reversible parts of the Preisach distribution. The irreversible part is what is determined by remanence-only methods and what is desired for characterization of the remanence behaviour of palaeomagnetic samples. The reversible part is most significant in detecting MD behaviour and screening out samples containing large PSD and MD grains.

This record has no associated files available for download.

More information

Published date: 2005

Identifiers

Local EPrints ID: 24173
URI: http://eprints.soton.ac.uk/id/eprint/24173
ISSN: 0956-540X
PURE UUID: c50f8597-363d-49b8-91c2-f9a889bf9cbb

Catalogue record

Date deposited: 24 Mar 2006
Last modified: 15 Mar 2024 06:53

Export record

Altmetrics

Contributors

Author: C. Carvallo
Author: D.J. Dunlop
Author: O. Ozdemir

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×