Low-temperature remanence in stable single domain magnetite

Details Low-temperature remanence in stable single domain magnetite Low-temperature remanence in stable single domain magnetite

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29g..33c&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 7, pp. 33-1, CiteID 1129, DOI 10.1029/2001GL014197

Physics

11

Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism

Scientific paper

A numerical model is developed in order to simulate the loss of low-temperature remanence while warming through the Verwey transition. We concentrate on the amount of remanence lost (δfc and δzfc) during field cooled and zero field cooled low temperature demagnetization curves for stable single domain (SSD) particles of (1) inorganic magnetite and (2) biogenic magnetite in the form of magnetosome chains. The model predicts that delta ratios (δfc/δzfc) for inorganic SSD magnetite increase from 1 to 1.6 with increasing aspect ratio and that magnetosome chains have elevated delta ratios of at least 2.0. Disaggregated magnetosomes are predicted to behave similarly to inorganic acicular SSD magnetite. The numerical results agree with experimental results.

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