Low‐temperature remanence in stable single domain magnetite

Brian Carter‐Stiglitz, Mike Jackson, Bruce Moskowitz

doi:10.1029/2001gl014197

Low‐temperature remanence in stable single domain magnetite

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Brian Carter‐Stiglitz

Institute for Rock Magnetism, Newton Horace Winchell School of Earth Sciences University of Minnesota USA
Mike Jackson

Institute for Rock Magnetism, Newton Horace Winchell School of Earth Sciences University of Minnesota USA
Bruce Moskowitz

Institute for Rock Magnetism, Newton Horace Winchell School of Earth Sciences University of Minnesota USA

書誌事項

公開日: 2002-04

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/2001gl014197

公開者: American Geophysical Union (AGU)

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説明

<jats:p>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 (δ<jats:sub><jats:italic>fc</jats:italic></jats:sub> and δ<jats:sub><jats:italic>zfc</jats:italic></jats:sub>) 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 (δ<jats:sub><jats:italic>fc</jats:italic></jats:sub>/δ<jats:sub><jats:italic>zfc</jats:italic></jats:sub>) 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.</jats:p>