Typical nanoparticle size histogram fitted with a log-normal distribution law. The inset displays the TEM picture for sample E12.
In-field Mössbauer spectra of samples at . The inset displays the canted spins fraction as a function of nanoparticle mean size.
Temperature dependence of the saturation magnetization (the dotted line is an eye guide). The inset displays a typical hysteresis loop recorded at for sample E12.
Temperature dependence of for samples E11 and E12.
is the crystalline mean size, and are the mean size and the polydispersity deduced from TEM, is the magnetization extrapolated to , and is the calculated thickness for the misaligned surface spin layer.
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