We present the first triple-axis neutron scattering measurements of magnetic fluctuations in nanoparticles using an antiferromagnetic reflection. Both the superparamagnetic relaxation and precession modes in ~15nm hematite particles are observed. The results have been consistently analyzed on the basis of a simple model with uniaxial anisotropy and the N\'eel-Brown theory for the relaxation.
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Hansen et al. (1997) studied this question.
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