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

Brian Carter-Stiglitz, Bruce Moskowitz, Michael Jackson

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Abstract

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 zerofield 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" (δfczfc) 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.

Original languageEnglish (US)
Pages (from-to)L06606 1-5
JournalGeophysical Research Letters
Volume31
Issue number6
StatePublished - Mar 28 2004

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