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- W2090330887 abstract "Approximately equidimensional magnetite crystals, with mean sizes of 215, 390, and 540 nm, respectively, have been produced by reducing hematite crystals. Isothermal magnetic hysteresis properties show a clear progression toward multidomain‐like behavior as the mean grain size increases. Saturation remanences M rs are only 5–10% of saturation magnetization M s , coercive forces H C are low (5.5–8 mT), and both M rs and H C have grain‐size dependences compatible with those previously established for smaller and larger hydrothermally produced magnetites. Coercivities during remanence acquisition are greater than those measured during demagnetization. The difference between acquisition and destructive fields increases in the larger grains as a result of the increasing importance of the internal demagnetizing field. The low‐temperature transition is well expressed in the M rs and H C data of the 540‐nm sample but is more subdued for smaller grains. Magnetostrictive, magnetocrystalline, and magnetostatic mechanisms in turn govern coercivity as the temperature rises. Remanence and coercivity ratios, M rs / M s and H R / H C , are almost temperature independent up to 500°C, indicating that domain wall configurations resulting from saturating fields are about the same at any temperature. A thermal fluctuation analysis of high‐temperature coercive force data suggests that regions 200–250 nm in size are thermally activated as a unit in grains of all sizes; these are likely domain walls. Apparent demagnetizing factors calculated from both low‐ and high‐temperature data are consistent with a mixture of two‐domain (2D) and three‐domain (3D) grains in all samples. However, theories of remanence in conventional 2D and 3D grains or in mixtures of 2D, 3D, and metastable single‐domain grains do not explain the data in a satisfying way." @default.
- W2090330887 created "2016-06-24" @default.
- W2090330887 creator A5003722800 @default.
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- W2090330887 date "1990-05-10" @default.
- W2090330887 modified "2023-10-11" @default.
- W2090330887 title "Low‐temperature and high‐temperature hysteresis of small multidomain magnetites (215–540 nm)" @default.
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- W2090330887 doi "https://doi.org/10.1029/jb095ib05p07069" @default.
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