First-order reversal curve (FORC) diagrams of magnetic mixtures: Micromagnetic models and measurements


Carvallo, C., Muxworthy, A.R. and Dunlop, D.J. (2006) First-order reversal curve (FORC) diagrams of magnetic mixtures: Micromagnetic models and measurements. Physics of the Earth and Planetary Interiors, 154, (3-4), 306-322. (doi:10.1016/j.pepi.2005.06.017).

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Description/Abstract

First-order reversal curve (FORC) diagrams were modelled and experimentally measured for different assemblages of single-domain (SD) magnetite particles with bimodal distributions of coercivities, and varying concentrations. When fitting end-member FORC diagrams to the FORC diagrams of mixtures, linear additivity is obeyed for the non-interacting mixtures, with predicted mixing ratios within the errorbars of the actual mixing ratios. Interacting mixtures are not always linearly additive. Experimental bimodal mixtures of magnetite particles (SD + pseudo-single-domain, PSD) have FORC diagrams that are usually linearly additive, regardless of the magnetite concentration of the sample (10 or 1%). Measured FORC diagrams of mixtures of SD magnetite and SD hematite again show that linear additivity of the two end-members holds. However, the very small Ms of hematite compared to that of magnetite makes it difficult to detect a contribution on a FORC diagram from hematite, unless it comprises at least 88% of the mixture.

Item Type: Article
ISSNs: 0031-9201 (print)
Related URLs:
Keywords: FORC diagram; interactions; micromagnetic model; magnetic mixtures; SD magnetite
Subjects: Q Science > QE Geology
Divisions: University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 44704
Date Deposited: 08 Mar 2007
Last Modified: 27 Mar 2014 18:29
URI: http://eprints.soton.ac.uk/id/eprint/44704

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