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- W2015581981 abstract "The Day plot ( M rs / M s versus H cr / H c ) is widely used by paleomagnetists to estimate the size of ferromagnetic grains and classify them as single‐domain (SD), pseudo‐single‐domain (PSD,) or multidomain (MD). How reliable is this plot? To find out, a numerical micromagnetic model is used to calculate hysteresis loops as a function of grain size for two grain shapes (cube and cuboid with X = 1.5Y = 1.4Z). Magnetocrystalline anisotropy is ignored. The average M rs / M s is calculated for a collection of randomly oriented grains: In the elongated grain it drops from 0.4 to 0.06 over a negligible size range, almost missing the usual PSD range altogether. Other hysteresis parameters, H c , H cr , and χ0, can only be calculated for a grain at a time. This is done for two magnetic field directions (close to the longest axis and close to the shortest axis). The single‐grain values of H cr / H c depend strongly on field direction, but it is clear that the average jumps rapidly from SD to MD values. There are large, rapid fluctuations in H cr and χ0 associated with changes in remanent states. However, these fluctuations may not be apparent when averaged over a broad size range. This may explain why H cr and χ 0 depend weakly on grain size in real samples. In the size range studied (L ≤ 0.25 μm), hysteresis parameters do not represent a typical grain size. Instead, they depend strongly on the size distribution." @default.
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- W2015581981 date "2000-08-10" @default.
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- W2015581981 title "Size dependence of hysteresis properties of small pseudo‐single‐domain grains" @default.
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- W2015581981 doi "https://doi.org/10.1029/2000jb900122" @default.
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