Dynamically generated pure spin current in single-layer graphene
Dynamically generated pure spin current in single-layer graphene
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DOI：
10.1103/physrevb.87.140401
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发表时间：
2013-04-02
影响因子：
3.7
通讯作者：
Shiraishi, Masashi
中科院分区：
文献类型：
--
作者：
Tang, Zhenyao;Shikoh, Eiji;Shiraishi, Masashi
电导失配问题严重限制了自旋注入效率，而自旋注入石墨烯通常需要高质量的隧道势垒来绕过电导失配。我们介绍了一种通过动态自旋注入在单层石墨烯(SLG)中产生纯自旋电流的方法，该方法没有电导失配。利用基于Landau-Lifshitz-Gilbert方程的常规理论模型，成功地实现了室温下SLG中自旋泵浦诱导的自旋流产生和自旋输运的实验演示，并估算出自旋相干长度为1.36微米。自旋相干长度与SLG的质量成正比，这表明SLG中的自旋弛豫符合Elliot-Yafet机制。DOI：10.1103/PhysRevB.87.140401
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 mu m 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. DOI: 10.1103/PhysRevB.87.140401