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    Spin-torque generation in topological insulator based heterostructures

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    PhysRevB.93.125303.pdf
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    Type
    Article
    Authors
    Fischer, Mark H.
    Vaezi, Abolhassan
    Manchon, Aurelien cc
    Kim, Eun-Ah
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2016-03-11
    Permanent link to this record
    http://hdl.handle.net/10754/603505
    
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    Abstract
    Heterostructures utilizing topological insulators exhibit a remarkable spin-torque efficiency. However, the exact origin of the strong torque, in particular whether it stems from the spin-momentum locking of the topological surface states or rather from spin-Hall physics of the topological-insulator bulk, remains unclear. Here, we explore a mechanism of spin-torque generation purely based on the topological surface states. We consider topological-insulator-based bilayers involving ferromagnetic metal (TI/FM) and magnetically doped topological insulators (TI/mdTI), respectively. By ascribing the key theoretical differences between the two setups to location and number of active surface states, we describe both setups within the same framework of spin diffusion of the nonequilibrium spin density of the topological surface states. For the TI/FM bilayer, we find large spin-torque efficiencies of roughly equal magnitude for both in-plane and out-of-plane spin torques. For the TI/mdTI bilayer, we elucidate the dominance of the spin-transfer-like torque. However, we cannot explain the orders of magnitude enhancement reported. Nevertheless, our model gives an intuitive picture of spin-torque generation in topological-insulator-based bilayers and provides theoretical constraints on spin-torque generation due to topological surface states.
    Citation
    Spin-torque generation in topological insulator based heterostructures 2016, 93 (12) Physical Review B
    Sponsors
    The authors are grateful to A. Mellnik and D. Ralph for helpful discussions.M.H.F. and E.-A.K. acknowledge support from NSF Grant No. DMR-0955822 and from NSF Grant No. DMR-1120296 to the Cornell Center for Materials Research. M.H.F. further acknowledges the Swiss Society of Friends of the Weizmann Institute of Science. A.M. was supported by the King Abdullah University of Science and Technology (KAUST).
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/PhysRevB.93.125303
    arXiv
    1305.1328
    Additional Links
    http://link.aps.org/doi/10.1103/PhysRevB.93.125303
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevB.93.125303
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program

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