Transverse thermoelectric effect in La0.67Sr0.33MnO3|SrRuO3 superlattices

TL;DR

This study investigates the transverse thermoelectric effects in ferromagnetic superlattices of La0.67Sr0.33MnO3 and SrRuO3, revealing unique voltage signs and magnetic coupling behaviors influenced by spin Seebeck effects.

Contribution

It demonstrates the influence of spin Seebeck effects and interlayer magnetic coupling on thermoelectric responses in ferromagnetic superlattices, a novel insight in thermoelectric research.

Findings

Opposite thermoelectric voltage sign compared to single layers at 200 K

Magnetothermoelectric curves shift due to antiferromagnetic coupling at 10 K

Spin Seebeck effects significantly affect superlattice thermoelectric behavior

Abstract

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.