  The longitudinal spin-Seebeck effect (LSSE) has been investigated for
Pt/yttrium iron garnet (YIG) bilayer systems. The magnitude of the voltage
induced by the LSSE is found to be sensitive to the Pt/YIG interface condition.
We observed large LSSE voltage in a Pt/YIG system with a better crystalline
interface, while the voltage decays steeply when an amorphous layer is
introduced at the interface artificially.
