All-oxide spin Seebeck effects

TL;DR

This paper demonstrates the observation of longitudinal spin Seebeck effects in an all-oxide bilayer system, showing potential for low-cost, stable, and transparent spin-current thermoelectric devices.

Contribution

It reports the first observation of LSSE in an all-oxide IrO₂/Y₃Fe₅O₁₂ bilayer system, expanding the material platform for spin Seebeck effect applications.

Findings

Spin currents generated by temperature gradients detected as voltage.

Voltage proportional to temperature gradient and consistent with LSSE.

Potential for low-cost, stable, transparent thermoelectric devices.

Abstract

We report the observation of longitudinal spin Seebeck effects (LSSE) in an all-oxide bilayer system comprising an IrO$_2$ film and an Y$_3$Fe$_5$O$_{12}$ film. Spin currents generated by a temperature gradient across the IrO$_2$/Y$_3$Fe$_5$O$_{12}$ interface were detected as electric voltage via the inverse spin Hall effect in the conductive IrO$_2$ layer. This electric voltage is proportional to the magnitude of the temperature gradient and its magnetic field dependence is well consistent with the characteristic of the LSSE. This demonstration may lead to the realization of low-cost, stable, and transparent spin-current-driven thermoelectric devices.