High temperature spin Hall effect in topological insulator

Applications of spin-orbit torque (SOT) spintronic devices to automobile or space vehicles require a spin Hall material with high performance at high temperature (>120 degrees C). However, the spin Hall effect has been studied so far in many materials mostly from cryogenic to room temperature. Here, we studied the spin Hall effect in BiSb topological insulator up to 125 degrees C. Although the effective spin Hall angle ? SH eff of BiSb monotonically decreases with increasing temperature, BiSb maintains a large ? SH eff of 4.9 even at 125 degrees C, demonstrating the capability of BiSb for high temperature applications. Furthermore, the temperature-dependence of the spin Hall conductivity indicates that the topological surface states are the origin of the giant spin Hall effect in BiSb.

Automated summary

In this study, we experimentally investigated the spin Hall effect in BiSb topological insulator from room temperature to 125°C. Despite the decreasing effective spin Hall angle with increasing temperature, BiSb maintained a high spin Hall angle of 4.9 even at 125°C, demonstrating its potential for high temperature applications. Furthermore, the temperature-dependence of the spin Hall conductivity indicated that the topological surface states are the origin of the giant spin Hall effect in BiSb.