Effect of contacts on spin lifetime measurements in graphene
Effect of contacts on spin lifetime measurements in graphene
复制标题
接触对石墨烯自旋寿命测量的影响
DOI：
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复制
发表时间：
2014
期刊：
影响因子：
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通讯作者：
V. Aji
中科院分区：
文献类型：
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作者：
E. Sosenko;Huazhou Wei;V. Aji
在传导通道中注入、传输和检测自旋是自旋电子器件的基本组成部分。在运输过程中长的自旋寿命是实现这项技术的重要组成部分。石墨烯是一个很有吸引力的平台，它具有高迁移率和低自旋-轨道耦合。不幸的是，测量到的自旋寿命比理论上预期的要小几个数量级。自旋损失的一个来源是铁磁电极和石墨烯之间的电阻失配。虽然已经对此进行了数值研究，但这里我们给出了Hanle自旋进动的封闭形式表达式，这是测量自旋寿命的标准方法。这允许对非局域自旋阀装置进行详细的表征。
Injection, transmission, and detection of spins in a conducting channel are the basic ingredients of spintronic devices. Long spin lifetimes during transit are an important ingredient in realizing this technology. An attractive platform for this purpose is graphene, which has high mobilities and low spin-orbit coupling. Unfortunately, measured spin lifetimes are orders of magnitude smaller than theoretically expected. A source of spin loss is the resistance mismatch between the ferromagnetic electrodes and graphene. While this has been studied numerically, here we provide a closed form expression for Hanle spin precession which is the standard method of measuring spin lifetimes. This allows for a detailed characterization of the nonlocal spin valve device.