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    Enhanced Spin-Orbit Torque via Modulation of Spin Current Absorption

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    PhysRevLett.117.217206.pdf
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    PRL_SI_enhanced_SOT_by_Ru_Oct_20_2016_XP.pdf
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    Type
    Article
    Authors
    Qiu, Xuepeng
    Legrand, William
    He, Pan
    Wu, Yang
    Yu, Jiawei
    Ramaswamy, Rajagopalan
    Manchon, Aurelien cc
    Yang, Hyunsoo
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2016-11-18
    Permanent link to this record
    http://hdl.handle.net/10754/621917
    
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    Abstract
    The magnitude of spin-orbit torque (SOT), exerted to a ferromagnet (FM) from an adjacent heavy metal (HM), strongly depends on the amount of spin current absorbed in the FM. We exploit the large spin absorption at the Ru interface to manipulate the SOTs in HM/FM/Ru multilayers. While the FM thickness is smaller than its spin dephasing length of 1.2 nm, the top Ru layer largely boosts the absorption of spin currents into the FM layer and substantially enhances the strength of SOT acting on the FM. Spin-pumping experiments induced by ferromagnetic resonance support our conclusions that the observed increase in the SOT efficiency can be attributed to an enhancement of the spin-current absorption. A theoretical model that considers both reflected and transmitted mixing conductances at the two interfaces of FM is developed to explain the results.
    Citation
    Qiu X, Legrand W, He P, Wu Y, Yu J, et al. (2016) Enhanced Spin-Orbit Torque via Modulation of Spin Current Absorption. Physical Review Letters 117. Available: http://dx.doi.org/10.1103/PhysRevLett.117.217206.
    Sponsors
    This research is supported by the National Research Foundation (NRF), Prime Minister’s Office, Singapore, under its Competitive Research Programme (CRP Award No. NRFCRP12-2013-01). H. Y. is a member of the Singapore Spintronics Consortium (SG-SPIN). A. M. acknowledges support from King Abdullah University of Science and Technology (KAUST).
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review Letters
    DOI
    10.1103/PhysRevLett.117.217206
    arXiv
    arXiv:1610.06989
    Additional Links
    http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.217206
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevLett.117.217206
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program

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