More on the low-temperature magnetism of stable single domain magnetite: Reversibility and non-stoichiometry

Details More on the low-temperature magnetism of stable single domain magnetite: Reversibility and non-stoichiometry More on the low-temperature magnetism of stable single domain magnetite: Reversibility and non-stoichiometry

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106606c&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 6, CiteID L06606

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7

Geomagnetism And Paleomagnetism: Biomagnetism, Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Geomagnetism And Paleomagnetism: General Or Miscellaneous

Scientific paper

The loss in remanence at the Verwey transition (TV) was modeled for elongate stable single domain magnetite for two experiments: 1) thermal cycling of room temperature saturation isothermal remanent magnetization (RTSIRM), 300 -> 10 -> 300 K, and 2) warming of zero-field cooled and field-cooled remanences from 10 K to 300 K. The RTSIRM simulations used magnetocrystalline anisotropy constants for stoichiometric magnetite and aspect ratios (AR) from 1 to ∞, for assemblages of inorganic particles and 10-magnetosome chains. The results match the experimentally observed behavior of reversibility. The second set of simulations was conducted with low-temperature magnetocrystalline anisotropy constants for varying degrees of non-stoichiometry, and AR = 5. Minor non-stoichiometry lowers the drop in remanence at TV and increases the ``delta ratio'' (δfc/δzfc) to values as high as ~6. New experiments demonstrate that maghematization (non-stoichiometry) can partly explain the low-temperature magnetic behavior observed in magnetotactic magnetite to date.

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