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Low‐temperature remanence in stable single domain magnetite
Author(s) -
CarterStiglitz Brian,
Jackson Mike,
Moskowitz Bruce
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl014197
Subject(s) - magnetite , remanence , acicular , magnetosome , demagnetizing field , single domain , materials science , natural remanent magnetization , geology , magnetic domain , magnetic field , magnetization , composite material , physics , metallurgy , microstructure , quantum mechanics
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 fc and δ zfc ) 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 fc /δ zfc ) 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.