EarthRef.org Reference Database (ERR) -- Carter-Stiglitz et al. 2002

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 (dfc and dzfc) 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 (dfc/dzfc) 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. 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 (dfc and dzfc) 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 (dfc/dzfc) 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.