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    Spin Hall effect by surface roughness

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    PhysRevB.91.045407.pdf
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    Type
    Article
    Authors
    Zhou, Lingjun
    Grigoryan, Vahram L.
    Maekawa, Sadamichi
    Wang, Xuhui
    Xiao, Jiang
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2015-01-08
    Preprint Posting Date
    2014-07-31
    Permanent link to this record
    http://hdl.handle.net/10754/346762
    
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    Abstract
    The spin Hall and its inverse effects, driven by the spin orbit interaction, provide an interconversion mechanism between spin and charge currents. Since the spin Hall effect generates and manipulates spin current electrically, to achieve a large effect is becoming an important topic in both academia and industries. So far, materials with heavy elements carrying a strong spin orbit interaction, provide the only option. We propose here a new mechanism, using the surface roughness in ultrathin films, to enhance the spin Hall effect without heavy elements. Our analysis based on Cu and Al thin films suggests that surface roughness is capable of driving a spin Hall angle that is comparable to that in bulk Au. We also demonstrate that the spin Hall effect induced by surface roughness subscribes only to the side-jump contribution but not the skew scattering. The paradigm proposed in this paper provides the second, not if only, alternative to generate a sizable spin Hall effect.
    Citation
    Spin Hall effect by surface roughness 2015, 91 (4) Physical Review B
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/PhysRevB.91.045407
    arXiv
    1407.8310
    Additional Links
    http://link.aps.org/doi/10.1103/PhysRevB.91.045407
    http://arxiv.org/abs/1407.8310
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevB.91.045407
    Scopus Count
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    Articles; Physical Science and Engineering (PSE) Division

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