  Transverse thermoelectric effects in response to an out-of-plane heat current
have been studied in an external magnetic field for ferromagnetic superlattices
consisting of La0.67Sr0.33MnO3 and SrRuO3 layers. The superlattices were
fabricated on SrTiO3 substrates by pulsed laser deposition. We found that the
sign of the transverse thermoelectric voltage for the superlattices is opposite
to that for La0.67Sr0.33MnO3 and SrRuO3 single layers at 200 K, implying an
important role of spin Seebeck effects inside the superlattices. At 10 K, the
magnetothermoelectric curves shift from the zero field due to an
antiferromagnetic coupling between layers in the superlattices.
