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Temperature dependence of the median value of the order parameter, b50(T) for interacting 20 nm hematite nanoparticles. The open squares are the experimental data, and the solid line is a fit to the superferromagnetism model (Equation 11). Adapted from Hansen, M. F. ; Koch, C. B.; Mørup, S. Magnetic dynamics of weakly and strongly interacting hematite nanoparticles, Phys. Rev. B 2000, 62, 1124. Copyright (2000) by the American Physical Society.
