  We report the first experimental observation of the spin Seebeck effect in
magnetite thin films. The signal observed at temperatures above the Verwey
transition is a contribution from both the anomalous Nernst (ANE) and spin
Seebeck effects (SSE). The contribution from the ANE of the Fe3O4 layer to the
SSE is found to be negligible due to the resistivity difference between Fe3O4
and Pt layers. Below the Verwey transition the SSE is free from the ANE of the
ferromagnetic layer and it is also found to dominate over the ANE due to
magnetic proximity effect on the Pt layer.
