He Xin, Zhang Chenhui, Zheng Dongxing, Li Peng, Xiao John Q, Zhang Xixiang
Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China.
ACS Appl Mater Interfaces. 2023 Feb 8;15(7):9649-55. doi: 10.1021/acsami.2c21918.
With recent advances in two-dimensional (2D) ferromagnets with enhanced Curie temperatures, it is possible to develop all-2D spintronic devices with high-quality interfaces using 2D ferromagnets. In this study, we have successfully fabricated nonlocal spin valves with FeGeTe (FGT) as the spin source and detector and multilayer graphene as the spin transport channel. The nonlocal spin transport signal was found to strongly depend on temperature and disappear at a temperature below the Curie temperature of the FGT flakes, which stemmed from the temperature-dependent ferromagnetism of FGT. The spin injection efficiency was estimated to be about 1%, close to that of conventional nonlocal spin valves with transparent contacts between ferromagnetic electrodes and the graphene channel. In addition, the spin transport signal was found to depend on the direction of the magnetic field and the magnitude of the current, which was due to the strong perpendicular magnetic anisotropy of FGT and the thermal effect, respectively. Our results provide opportunities to extend the applications of van der Waals heterostructures in spintronic devices.
随着具有更高居里温度的二维（2D）铁磁体的最新进展，利用二维铁磁体开发具有高质量界面的全二维自旋电子器件成为可能。在本研究中，我们成功制备了以FeGeTe（FGT）作为自旋源和探测器、多层石墨烯作为自旋传输通道的非局域自旋阀。发现非局域自旋传输信号强烈依赖于温度，并且在低于FGT薄片居里温度的温度下消失，这源于FGT的温度依赖性铁磁性。自旋注入效率估计约为1%，接近铁磁电极与石墨烯通道之间具有透明接触的传统非局域自旋阀。此外，发现自旋传输信号分别取决于磁场方向和电流大小，这分别归因于FGT的强垂直磁各向异性和热效应。我们的结果为扩展范德华异质结构在自旋电子器件中的应用提供了机会。
