Wu Yanfei, Cui Qirui, Zhu Mengyuan, Liu Xinjie, Wang Yi, Zhang Jingyan, Zheng Xinqi, Shen Jianxin, Cui Ping, Yang Hongxin, Wang Shouguo
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
ACS Appl Mater Interfaces. 2021 Mar 3;13(8):10656-10663. doi: 10.1021/acsami.1c00551. Epub 2021 Feb 17.
The efforts toward the experimental realization of spin-polarized transports in ideal materials or platforms, such as the magnetized graphene or various quantum Hall states, is a research hotspot in spintronics. Magnetic van der Waals materials open the door for exploring various physical phenomena, technologies, and integrating novel spintronic devices seamlessly within the 2D limit. Here, we demonstrate magnetic proximity effect in chromium trichloride (CrCl)/bilayer graphene (BLG) heterostructures by low-temperature transport measurements. An effective exchange field induced in BLG has been demonstrated by the Zeeman spin Hall effect via nonlocal measurements. Furthermore, the exchange field modulates the quantum Hall ground state of BLG and thus favors the formation of a canted antiferromagnetic (CAF) phase in an external perpendicular magnetic field (). Asymmetric nonlocal magneto-transport behaviors are also observed at opposite directions, due to the asymmetric modulation on the exchange field by external directions. Our work suggests that the 2D magnetic van der Waals materials and graphene hybrid systems offer a unique platform for quantum Hall ferromagnetism physics.
在诸如磁化石墨烯或各种量子霍尔态等理想材料或平台上实现自旋极化输运的实验努力，是自旋电子学中的一个研究热点。磁性范德华材料为探索各种物理现象、技术以及在二维极限内无缝集成新型自旋电子器件打开了大门。在此，我们通过低温输运测量展示了三氯化铬（CrCl）/双层石墨烯（BLG）异质结构中的磁近邻效应。通过非局域测量，利用塞曼自旋霍尔效应在BLG中证明了有效交换场的存在。此外，该交换场调制了BLG的量子霍尔基态，因此有利于在外部垂直磁场（）中形成倾斜反铁磁（CAF）相。由于外部方向对交换场的不对称调制，在相反方向也观察到了不对称的非局域磁输运行为。我们的工作表明，二维磁性范德华材料与石墨烯混合系统为量子霍尔铁磁体物理学提供了一个独特的平台。
