  We present results on the longitudinal spin Seebeck effect (LSSE) shown by
semiconducting ferrimagnetic NiFe2O4/Pt films from room temperature down to 50K
base temperature. To the best of our knowledge, this is the first observation
of spin caloric effect in NiFe2O4 thin films. The temperature dependence of the
conductivity has been studied in parallel to obtain information about the
origin of the electric potentials detected at the Pt coverage of the
ferrimagnet in order to distinguish the LSSE from the anomalous Nernst effect.
Furthermore, the dependence of the LSSE on temperature gradients as well as the
influence of an external magnetic field direction is investigated.
