Dynamically generated pure spin current in single-layer graphene

Zhenyao Tang, Eiji Shikoh, Hiroki Ago, Kenji Kawahara, Yuichiro Ando, Teruya Shinjo, Masashi Shiraishi

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    Abstract

    The conductance mismatch problem limits the spin-injection efficiency significantly, and spin injection into graphene usually requires high-quality tunnel barriers to circumvent the conductance mismatch. We introduce an approach which enables the generation of pure spin current into single-layer graphene (SLG) that is free from electrical conductance mismatch by using dynamical spin injection. An experimental demonstration of spin-pumping-induced spin current generation and spin transport in SLG at room temperature was successfully achieved, and the spin coherence length was estimated to be 1.36 μm by using a conventional theoretical model based on the Landau-Lifshitz-Gilbert equation. The spin coherence length is proportional to the quality of SLG, which indicates that spin relaxation in SLG is governed by the Elliot-Yafet mechanism, as was reported.

    Original languageEnglish
    Article number140401
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume87
    Issue number14
    DOIs
    Publication statusPublished - Apr 2 2013

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    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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