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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), pp. 306-322. (doi:10.1016/j.pepi.2005.06.017).

Record type: Article


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.

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Published date: 2006
Keywords: FORC diagram, interactions, micromagnetic model, magnetic mixtures, SD magnetite


Local EPrints ID: 44704
ISSN: 0031-9201
PURE UUID: b36117cd-6666-479c-998b-0fa568b9aa2c

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Date deposited: 08 Mar 2007
Last modified: 17 Jul 2017 15:13

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Author: C. Carvallo
Author: A.R. Muxworthy
Author: D.J. Dunlop

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