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arXiv · 1211.0124

Dynamically-generated pure spin current in single-layer graphene

Zhenyao Tang1·Eiji Shikoh1·Hiroki Ago2·Kenji Kawahara2·Yuichiro Ando1·Teruya Shinjo1·Masashi Shiraishi1
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Abstract

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

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Zhenyao Tang1, Eiji Shikoh1, Hiroki Ago2, Kenji Kawahara2, Yuichiro Ando1, Teruya Shinjo1, Masashi Shiraishi1. 2012-11-01. Dynamically-generated pure spin current in single-layer graphene. https://doi.org/10.1103/physrevb.87.140401

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