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 similar to 15 nm hematite particles are: observed. The results have been consistently analyzed on the basis of a simple model with uniaxial anisotropy and the Neel-Brown theory for the relaxation.
Bibliographical noteCopyright (1997) by the American Physical Society.
Hansen, M. F., Bødker, F., Mørup, S., Lefmann, K., Clausen, K. N., & Lindgård, P-A. (1997). Dynamics of Magnetic Nanoparticles Studied by Neutron Scattering. Physical Review Letters, 79(24), 4910-4913. https://doi.org/10.1103/PhysRevLett.79.4910