Presentation Information
[10p-PA3-30]Effects of Pd and Co2MnGa thicknesses on current-induced torque in perpendicularly magnetized Pd/Co2MnGa
〇Takaya Koyama1, Tetsuya Uemura1, Michihiko Yamanouchi1 (1.Hokkaido Univ.)
Keywords:
orbital torque,magnetization switching
Recently, orbital torque (OT) has attracted considerable attention as an alternative writing mechanism to spin-orbit torque (SOT) in three-terminal spintronics devices, owing to its potential to reduce the writing current. To further enhance the current efficiency via OT, we focus on the Heusler alloy Co2MnGa (CMG), which is expected to enable efficient conversion of orbital currents into spin currents due to its relatively strong spin-orbit interaction. In this study, we investigated the Pd and CMG thickness dependence of the current-induced torque in Pd/CMG bilayers to clarify its origin. The effective spin Hall angle was negative and increased in magnitude with increasing Pd and CMG thicknesses. These results strongly suggest that the current-induced torque in Pd/CMG is dominated by OT generated in Pd, which is opposite to and larger than the conventional Pd-induced SOT.