Abstract
A thin magnetite film grown by molecular-beam epitaxy on MgO(100) was studied by nuclear resonant scattering (NRS) at grazing incidence geometry. We show that the NRS data yield more information about the shape of the directional spin distribution than M\"ossbauer spectroscopy, in which only the average angle with respect to the photon wave vector can be measured. We fit our data with a micromagnetic model describing the spin orientation in magnetite films. Within this model the average magnetic domain size is estimated to be $106\ifmmode\pm\else\textpm\fi{}6\mathrm{nm}.$ The relation between the spin structure and the magnetoresistance in magnetite films is discussed.
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