Composition dependence of spin-orbit torque in Pt1-x Mnx /CoFeB heterostructures

K. Vihanga De Zoysa, Samik Duttagupta, Ryuichi Itoh, Yutaro Takeuchi, Hideo Ohno, Shunsuke Fukami

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5 Citations (Scopus)


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 (ζ SL and ζ FL) show non-monotonic variation and a different trend with respect to x, and considerably large ζ 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.

Original languageEnglish
Article number012402
JournalApplied Physics Letters
Issue number1
Publication statusPublished - 2020 Jul 6


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