Observation of Longitudinal Spin Seebeck Effect with Various Transition Metal Films

TL;DR

This study investigates how different transition metal films affect the longitudinal spin Seebeck effect, revealing dependencies on spin Hall effect, resistivity, and ferromagnetic resonance, confirming spin current as the core mechanism.

Contribution

The paper provides a comparative analysis of ten transition metals, highlighting how their properties influence the spin Seebeck effect and spin current generation.

Findings

Spin Seebeck coefficients vary with transition metal type.

Sign of spin Seebeck effect depends on inverse spin Hall effect.

Spin-dependent behaviors observed under ferromagnetic resonance.

Abstract

We evaluated the thermoelectric properties of longitudinal spin Seebeck devices by using ten different transition metals (TMs). Both the intensity and sign of spin Seebeck coefficients were noticeably dependent on the degree of the inverse spin Hall effect and the resistivity of each TM film. Spin dependent behaviors were also observed under ferromagnetic resonance. These results indicate that the output of the spin Seebeck devices originates in the spin current.