Large positive in-plane magnetoresistance induced by localized states at nanodomain boundaries in graphene.
Large positive in-plane magnetoresistance induced by localized states at nanodomain boundaries in graphene.
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DOI：
10.1038/ncomms14453
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发表时间：
2017-02-15
影响因子：
16.6
通讯作者：
Chang CR
中科院分区：
文献类型：
--
作者：
Wu HC;Chaika AN;Hsu MC;Huang TW;Abid M;Abid M;Aristov VY;Molodtsova OV;Babenkov SV;Niu Y;Murphy BE;Krasnikov SA;Lübben O;Liu H;Chun BS;Janabi YT;Molotkov SN;Shvets IV;Lichtenstein AI;Katsnelson MI;Chang CR
石墨烯在室温下支持长自旋寿命和长扩散长度，使其在自旋电子学方面具有很大的应用前景。然而，尽管提出了许多解决方案，但使石墨烯具有磁性仍然是一个主要挑战。其中，具有锯齿形边缘和波纹的石墨烯是最有希望的候选材料，因为锯齿形边缘被预测为包含自旋极化电子态，而波纹可以诱导自旋-轨道耦合。在这里，我们研究了生长在技术相关的碳化硅/硅(001)晶片上的石墨烯的磁电阻，其中固有的纳米域边界夹在大曲率的相邻波纹之间的Z字形结构。在纳米域界面处的局域态导致了前所未有的正的面内磁阻，并且具有很强的温度依赖性。我们的工作可能会提供一种诱人的方法来增加石墨烯的自旋自由度。由于石墨烯具有较长的自旋寿命和扩散长度，在自旋电子学方面具有广阔的应用前景，但它并不具有固有的磁性。在这里，作者在实验上观察到了石墨烯纳米域界面上的大的正磁阻。
Graphene supports long spin lifetimes and long diffusion lengths at room temperature, making it highly promising for spintronics. However, making graphene magnetic remains a principal challenge despite the many proposed solutions. Among these, graphene with zig-zag edges and ripples are the most promising candidates, as zig-zag edges are predicted to host spin-polarized electronic states, and spin–orbit coupling can be induced by ripples. Here we investigate the magnetoresistance of graphene grown on technologically relevant SiC/Si(001) wafers, where inherent nanodomain boundaries sandwich zig-zag structures between adjacent ripples of large curvature. Localized states at the nanodomain boundaries result in an unprecedented positive in-plane magnetoresistance with a strong temperature dependence. Our work may offer a tantalizing way to add the spin degree of freedom to graphene. Owing to long spin lifetime and diffusion length, graphene holds promise for spintronics, yet it does not possess intrinsic magnetic properties. Here, the authors observe experimentally a large, positive magnetoresistance at graphene nanodomain boundaries.