Low magnification TEM image of iron nanoparticles and corresponding size histogram calculated over 2500 objects.
(a) SQUID measurement of ZFC and FC magnetizations and . Inset shows invert ZFC magnetization vs temperature. (b) Hysteresis curve measured at .
(a) Mössbauer spectra of iron nanoparticles measured at . Black ticks correspond to experimental data. The solid line is the simulated results obtained with (b) the corresponding fitted contributions.
Magnetization vs applied field for temperatures between 20 and . Open symbols correspond to the experimental results. The solid lines with the “plein” symbols are the theoretical magnetization curves calculated using modified Langevin functions with atoms, including the influence of a unixial anisotropy of and the previously estimated dependence.
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