Regulatable thermoelectric effect in heterostructured ferromagnetic nanomultilayers

Abstract

Thermoelectric materials and devices have the potential to directly convert heat into electricity, making them crucial for advancing the energy structure system and achieving the dual-carbon goal. However, the conventional methods of preparing thermoelectric materials and designing devices still face significant challenges, limiting the widespread application of thermoelectric technology. Ferromagnetic metal heterostructured nanomultilayers play a crucial role in generating, transporting, and detecting spin currents. Studying the properties and physical mechanisms of spin-dependent magnetic-thermal-electrical effects in the core material is essential for advancing spin thermoelectrics in the future. In this paper, we investigate the spin-related thermoelectric effects in artificial spin-valve heterostructured nanomultilayers. The spin-current generating layer is made of rare-earth garnet, while the spin-current detecting layer consists of ferromagnetic alloy thin films with different compositions of Fe–Co. It is being investigated to obtain thermal voltage signals with excellent stability and high resolution as well as to achieve the amplification and positive/negative adjustment of these signals. This study can serve as a reference for designing thermoelectric materials and aiding in the development of future high-efficiency spin-thermoelectric conversion devices.