Electrical devices with an integral thermoelectric generator comprising a spin-Seebeck insulator and a spin orbit coupling material, and associated methods of fabrication. A spin-Seebeck thermoelectric material stack may be integrated into macroscale power cabling as well as nanoscale device structures. The resulting structures are to leverage the spin-Seebeck effect (SSE), in which magnons may transport heat from a source (an active device or passive interconnect) and through the spin-Seebeck insulator, which develops a resulting spin voltage. The SOC material is to further convert the spin voltage into an electric voltage to complete the thermoelectric generation process. The resulting electric voltage may then be coupled into an electric circuit.