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arXiv 1702.01971cond-mat.mes-hall
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在少层石墨烯/Pt横向异质结构中的大的室温自旋-电荷转换信号

Large room temperature spin-to-charge conversion signals in a few-layer graphene/Pt lateral heterostructure

Wenjing Yan, Edurne Sagasta, Mário Ribeiro, Yasuhiro Niimi, Luis E. Hueso, Fèlix Casanova

摘要:

不需要磁性材料而产生和检测纯自旋电流是实现全电控自旋电子器件的关键因素。在这个框架中,实现大的自旋-电荷转换信号是至关重要的,因为合理的应用需要相当大的输出。不幸的是,迄今为止获得的数值相当低。在这里,我们利用自旋霍尔效应通过使用Pt,一种非磁性金属与强自旋轨道耦合,产生和检测纯自旋电流在几层石墨烯通道。此外,石墨烯具有比金属更长距离的自旋传输和更高的电阻率的出色性能,使我们能够在石墨烯/Pt横向异质结构中实现迄今为止文献中报道的室温下最大的自旋到电荷电压信号。我们的方法为实现基于自旋轨道的逻辑电路和在没有磁场的情况下对自旋信息的所有电气控制开辟了令人兴奋的机会。

英文摘要:

Electrical generation and detection of pure spin currents without the need of magnetic materials are key elements for the realization of full electrically controlled spintronic devices. In this framework, achieving a large spin-to-charge conversion signal is crucial, since considerable outputs are needed for plausible applications. Unfortunately, the values obtained so far have been rather low. Here we exploit the spin Hall effect by using Pt, a non-magnetic metal with strong spin-orbit coupling, to generate and detect pure spin currents in a few-layer graphene channel. Furthermore, the outstanding properties of graphene, with long distance spin transport and higher electrical resistivity than metals, allows us to achieve in our graphene/Pt lateral heterostructures the largest spin-to-charge voltage signal at room temperature reported so far in the literature. Our approach opens up exciting opportunities towards the implementation of spin-orbit-based logic circuits and all electrical control of spin information without magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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