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Large damping-like spin–orbit torque in a ferromagnet/topological insulator bilayer from localized interfacial states

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Abstract

We calculate the electric field-induced damping-like spin–orbit torque in a ferromagnetic metal/topological insulator bilayer using the tight-binding method and the Kubo formula. The effective damping-like spin Hall conductivity converted from the spin accumulation in a ferromagnetic metal is comparable to the reported experimental values. We find that hybridized states emerge at the interface between a ferromagnetic metal and a topological insulator and these states are crucial for the large damping-like spin Hall conductivity. Our result provides one possible way to explain experimentally reported large damping-like spin–orbit torque in a ferromagnetic metal/topological insulator bilayer.

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Acknowledgements

S.S. and H.W.L. were supported by the Samsung Science and Technology Foundation (Grant No. BA-1501-51).

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  1. Department of Physics, Pohang University of Science and Technology, Pohang, 37673, Korea

    Seungju Shin & Hyun-Woo Lee

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  1. Seungju Shin
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Shin, S., Lee, HW. Large damping-like spin–orbit torque in a ferromagnet/topological insulator bilayer from localized interfacial states. J. Korean Phys. Soc. 80, 241–246 (2022). https://doi.org/10.1007/s40042-021-00378-7

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  • DOI: https://doi.org/10.1007/s40042-021-00378-7

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