11:15 AM - 11:30 AM
▼ [20a-E216-9] Composition dependence of spin-orbit torque in Pt1-xMnx/CoFeB heterostructures
Keywords:Antiferromagnet, Spin-orbit torques
Spin-orbit torque (SOT) in antiferromagnet (AFM)/ ferromagnet (FM) heterostructures is prospective for digital and analogue spintronic devices. The crucial requirements of co-existing large effective spin-Hall angle and significant exchange-bias field in a single material are satisfied in Mn-Y (Y = 4d or 5d transition metal) metallic AFMs, making them promising candidate for AFM-based spintronic devices. Previous results on Mn-Y/FM structures suggested the primary role of spin-orbit coupling of the d-transition element in determination of strength of SOTs , while subsequent results indicated an important role played by staggered magnetization of Mn . Thus, systematic studies of SOTs in metallic Mn-Y/FM structures with the variation of composition are of necessity for better comprehension of SOT generation mechanism. Here, we quantify SOTs in AFM/FM PtMn/CoFeB heterostructures as a function of PtMn composition to obtain insights into the origin of SOT generation in AFM/FM structures.