Thermally generated spin current in the topological insulator Bi₂Se₃.

ABSTRACT: We present measurements of thermally generated transverse spin currents in the topological insulator Bi₂Se₃, thereby completing measurements of interconversions among the full triad of thermal gradients, charge currents, and spin currents. We accomplish this by comparing the spin Nernst magneto-thermopower to the spin Hall magnetoresistance for bilayers of Bi₂Se₃/CoFeB. We find that Bi₂Se₃ does generate substantial thermally driven spin currents. A lower bound for the ratio of spin current density to thermal gradient is [Formula: see text] = (4.9 ± 0.9) × 10⁶ [Formula: see text], and a lower bound for the magnitude of the spin Nernst ratio is -0.61 ± 0.11. The spin Nernst ratio for Bi₂Se₃ is

SUBMITTER: Jain R 

PROVIDER: S-EPMC10848729 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature