K. Vihanga De Zoysa, S. DuttaGupta, Ryuichi Itoh, Y. Takeuchi, H. Ohno, S. Fukami
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引用次数: 7
Abstract
We investigate spin–orbit torques (SOTs) in heterostructures with Pt1−xMnx alloy and CoFeB as a function of Mn composition (x) by using an extended harmonic Hall measurement. Slonczewski-like and field-like SOT efficiencies ( ξ SL and ξ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ξ SL up to 0.21 is obtained at x = 0.20. Compared to the x dependence of longitudinal resistivity, the Slonczewski-like SOT in the low x region is mainly attributed to an intrinsic spin-Hall mechanism, whereas a non-monotonic variation in the higher x region suggests the presence of additional factors. The present findings deliver useful clues to understand the physics behind SOT generation in antiferromagnetic heterostructures and offer a route to realize efficient devices.
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