Abstract
We made Monte Carlo simulations of the energy distribution and magnetic moment contributions of surface and core sites in a model particle of spherical shape, intended as a simple representation of hematite colloids. We included exchange interactions between nearest neighbors, plus anisotropy and Zeeman energy terms. Model particles built with origin between lattice sites show a temperature dependence of magnetization consistent with previous measurements and explain the puzzling results of magnetic circular dichroism in samples of nanostructured hematite recently obtained with synchrotron radiation.
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