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首页> 外文期刊>Physical review >Transfer lengths and spin injection from a three-dimensional ferromagnet into graphene
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Transfer lengths and spin injection from a three-dimensional ferromagnet into graphene

机译：从三维铁磁体到石墨烯的传输长度和自旋注入

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摘要

In graphene spintronic devices, spin currents are injected and probed by three-dimensional ferromagnetic electrodes on a two-dimensional graphene layer. Here we develop a unified theory to understand the observed spin-injection signals and their dependence on a dc-bias current in these devices by different groups. The spin-dependent transfer length, which measures the length required for a current to change from lateral in graphene to vertical in the electrode, is found to play a central role in determining the spin-current distribution as well as the signal fidelity. The theory consistently explains the experiments and suggests that the observed dc-bias dependence is due not to change in the spin-injection efficiency but to redistribution of the spin current near the ferromagnetic electrode.
机译：在石墨烯自旋电子器件中，自旋电流被注入并由二维石墨烯层上的三维铁磁电极探测。在这里，我们建立了一个统一的理论，以了解观察到的自旋注入信号及其对不同设备在这些器件中对直流偏置电流的依赖性。发现自旋相关的传输长度（测量电流从石墨烯的横向变化到电极中的垂直方向所需的长度）在确定自旋电流分布以及信号保真度中起着核心作用。该理论一致地解释了实验，并建议观察到的直流偏置依赖性不是由于自旋注入效率的变化，而是由于自旋电流在铁磁电极附近的重新分布。

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