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    Spin-orbit torque in a three-dimensional topological insulator–ferromagnet heterostructure: Crossover between bulk and surface transport

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    PhysRevB.97.134402.pdf
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    Type
    Article
    Authors
    Ghosh, Sumit
    Manchon, Aurelien cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2018-04-02
    Permanent link to this record
    http://hdl.handle.net/10754/627571
    
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    Abstract
    Current-driven spin-orbit torques are investigated in a heterostructure composed of a ferromagnet deposited on top of a three-dimensional topological insulator using the linear response formalism. We develop a tight-binding model of the heterostructure adopting a minimal interfacial hybridization scheme that promotes induced magnetic exchange on the topological surface states, as well as induced Rashba-like spin-orbit coupling in the ferromagnet. Therefore our model accounts for the spin Hall effect from bulk states together with inverse spin galvanic and magnetoelectric effects at the interface on equal footing. By varying the transport energy across the band structure, we uncover a crossover from surface-dominated to bulk-dominated transport regimes. We show that the spin density profile and the nature of the spin-orbit torques differ substantially in both regimes. Our results, which compare favorably with experimental observations, demonstrate that the large dampinglike torque reported recently is more likely attributed to the Berry curvature of interfacial states, while spin Hall torque remains small even in the bulk-dominated regime.
    Citation
    Ghosh S, Manchon A (2018) Spin-orbit torque in a three-dimensional topological insulator–ferromagnet heterostructure: Crossover between bulk and surface transport. Physical Review B 97. Available: http://dx.doi.org/10.1103/PhysRevB.97.134402.
    Sponsors
    This work was supported by the King Abdullah University of Science and Technology (KAUST). The authors would like to acknowledge support from KAUST Supercomputing facility.
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/PhysRevB.97.134402
    Additional Links
    https://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.134402
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevB.97.134402
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program

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