ScholarWorks@성균관대학교

초록

The spin generation in strong spin-orbit coupling systems has led to a large spin-orbit torque. Recently, the orbital generation in weak spin-orbit coupling systems was reported. In this study, we investigate the spin-orbit torque of a nonmagnet/ferromagnet bilayer, where the nonmagnet is Pt, Mn, and Pt0.5Mn0.5 alloy, and the ferromagnet is Fe, Co, and Ni. The highest SOT efficiency, i.e., the spin Hall angle, of 0.32 was achieved with the Pt0.5Mn0.5/Ni structure, which is three times larger than 0.1 with the Pt/Ni structure. For the SOT mechanism, we discuss the enhanced orbital or spin generation in the PtMn alloy. © 2024 Korean Physical Society