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    Dirac spin-orbit torques and charge pumping at the surface of topological insulators

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    PhysRevB.96.014408.pdf
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    Type
    Article
    Authors
    Ndiaye, Papa Birame cc
    Akosa, Collins Ashu cc
    Fischer, M. H.
    Vaezi, A.
    Kim, E.-A.
    Manchon, Aurelien cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2017-07-06
    Permanent link to this record
    http://hdl.handle.net/10754/625249
    
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    Abstract
    We address the nature of spin-orbit torques at the magnetic surfaces of topological insulators using the linear-response theory. We find that the so-called Dirac torques in such systems possess a different symmetry compared to their Rashba counterpart, as well as a high anisotropy as a function of the magnetization direction. In particular, the damping torque vanishes when the magnetization lies in the plane of the topological-insulator surface. We also show that the Onsager reciprocal of the spin-orbit torque, the charge pumping, induces an enhanced anisotropic damping. Via a macrospin model, we numerically demonstrate that these features have important consequences in terms of magnetization switching.
    Citation
    Ndiaye PB, Akosa CA, Fischer MH, Vaezi A, Kim E-A, et al. (2017) Dirac spin-orbit torques and charge pumping at the surface of topological insulators. Physical Review B 96. Available: http://dx.doi.org/10.1103/PhysRevB.96.014408.
    Sponsors
    P.B.N. and A.M. were supported by the King Abdullah University of Science and Technology (KAUST). P.B.N. thanks Z. T. Ndiaye for the fruitful discussions and valuable technical support, and A.M. acknowledges inspiring discussions with H. Yang, E. Y. Tsymbal, and J. Zhang. E.-A. K. was supported by NSF CAREER Award No. DMR-0955822 and by the Cornell Center for Materials Research with funding from the NSF MRSEC program (Grant No. DMR-1120296). M.H.F. acknowledges support from the Swiss Society of Friends of the Weizmann Institute of Science.
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/PhysRevB.96.014408
    arXiv
    1509.06929
    Additional Links
    https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.014408
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevB.96.014408
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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