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arXiv 1301.7611cond-mat.mes-hall
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石墨烯缺陷磁性的双重起源及其通过分子掺杂的可逆转换

Dual origin of defect magnetism in graphene and its reversible switching by molecular doping

R. R. Nair, I-Ling Tsai, M. Sepioni, O. Lehtinen, J. Keinonen, A. V. Krasheninnikov, A. H. Castro Neto, M. I. Katsnelson, A. K. Geim, I. V. Grigorieva

摘要:

通过使用电场来控制磁性的可能性是自旋电子学应用中最期望的特性之一。找到合适的材料仍然是一个难以捉摸的目标,到目前为止只找到了几个候选者。石墨烯是其中之一,并且由于其弱的自旋-轨道相互作用、通过电场效应控制电子性质的能力以及引入顺磁中心(例如空位和吸附原子)的可能性而提供了希望。在这里,我们表明,吸附原子的磁性在石墨烯是巡回的,可以通过掺杂控制,使磁矩可以打开和关闭。讨论较多的空位磁性被发现有一个双重的起源,有两个近似相等的贡献:一个来自相同的巡回磁性和其他由于断裂的债券。我们的工作表明,石墨烯的磁响应可以由场效应控制,类似于其输运和光学性质,并且自旋扩散长度可以在一定的载流子密度以上显著增强。

英文摘要:

A possibility to control magnetic properties by using electric fields is one of the most desirable characteristics for spintronics applications. Finding a suitable material remains an elusive goal, with only a few candidates found so far. Graphene is one of them and offers a hope due to its weak spin-orbit interaction, the ability to control electronic properties by the electric field effect and the possibility to introduce paramagnetic centres such as vacancies and adatoms. Here we show that adatoms magnetism in graphene is itinerant and can be controlled by doping, so that magnetic moments can be switched on and off. The much-discussed vacancy magnetism is found to have a dual origin, with two approximately equal contributions: one coming from the same itinerant magnetism and the other due to broken bonds. Our work suggests that magnetic response of graphene can be controlled by the field effect, similar to its transport and optical properties, and that spin diffusion length can be significantly enhanced above a certain carrier density.

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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