Mossbauer Studies of Magnetite Nanoparticles

Magnetite Fe3O4 samples with different levels of dispersion (bulk and nanoscale particles with an average diameter of 24, 14 and 7 nm) are studied using Mssbauer spectroscopy. It is shown that this method of analysis makes it possible to obtain important information about the features of magnetic states of iron-containing nanoparticles and, more specifically, about the distinction in effective magnetic fields for iron nuclei located in different regions within them. The obtained results are fully consistent with known the oretical data and allow estimation of the thickness of the surface region of the nanoparticles.