Magnetodynamics of ferrofluid γ-Fe 2 O 3 nanoparticles is studied by Quasi-Elastic Neutron Scattering between 10 K and 250 K in the frequency range 10 10 –10 12 Hz. We probe independently the precession of the core magnetic moment and surface spins fluctuations observed in a dissipative regime. These fluctuations slow down at low temperature leading to a frozen disorder of the surface layer.
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Gazeau et al. (1997) studied this question.
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