Liu Hui, Wang Heng, Peng Zhisheng, Jin Jiyou, Wang Zhongpu, Peng Kang, Wang Wenxiang, Xu Yushi, Wang Yu, Wei Zheng, Zhang Ding, Li Yong Jun, Chu Weiguo, Sun Lianfeng
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Nanoscale Horiz. 2023 Aug 21;8(9):1235-1242. doi: 10.1039/d3nh00233k.
An anomalous Hall effect (AHE) is usually presumed to be absent in pristine graphene due to its diamagnetism. In this work, we report that a gate-tunable Hall resistance can be obtained in edge-bonded monolayer graphene without an external magnetic field. In a perpendicular magnetic field, consists of a sum of two terms: one from the ordinary Hall effect and the other from the AHE (). Plateaus of ∼ 0.94/3 and ∼ 0.88/3 have been observed while the longitudinal resistance decreases at a temperature of 2 K, which are indications of the quantum version of the AHE. At a temperature of 300 K, shows a positive, giant magnetoresistance of ∼177% and still has a value of ∼400 Ω. These observations indicate the existence of a long-range ferromagnetic order in pristine graphene, which may lead to new applications in pure carbon-based spintronics.
由于本征石墨烯具有抗磁性，通常认为其不存在反常霍尔效应（AHE）。在这项工作中，我们报告了在没有外部磁场的边缘键合单层石墨烯中可以获得栅极可调的霍尔电阻。在垂直磁场中，由两项之和组成：一项来自普通霍尔效应，另一项来自反常霍尔效应（）。在2 K的温度下，当纵向电阻降低时，观察到约0.94/3和约0.88/3的平台，这是反常霍尔效应量子版本的迹象。在300 K的温度下，显示出约177%的正巨磁阻，并且仍然具有约400Ω的值。这些观察结果表明本征石墨烯中存在长程铁磁序，这可能会在纯碳基自旋电子学中带来新的应用。
