Chen Hao, Tian Wanghao, Zhang Lishu, Song Peng, Jia Lanxin, Chen Jingsheng, Zhu Zhifeng, Feng Yuan Ping, Loh Kian Ping
Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore.
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
Small. 2024 Nov;20(44):e2403073. doi: 10.1002/smll.202403073. Epub 2024 Jul 5.
Spin injection, transport, and detection across the interface between a ferromagnet and a spin-carrying channel are crucial for energy-efficient spin logic devices. However, interfacial conductance mismatch, spin dephasing, and inefficient spin-to-charge conversion significantly reduce the efficiency of these processes. In this study, it is demonstrated that an all van der Waals heterostructure consisting of a ferromagnet (FeGeTe) and Weyl semimetal enables a large spin readout efficiency. Specifically, a nonlocal spin readout signal of 150 mΩ and a local spin readout signal of 7.8 Ω is achieved, which reach the signal level useful for practical spintronic devices. The remarkable spin readout signal is attributed to suppressed spin dephasing channels at the vdW interfaces, long spin diffusion, and efficient charge-spin interconversion in T-MoTe. These findings highlight the potential of vdW heterostructures for spin Hall effect-enabled spin detection with high efficiency, opening up new possibilities for spin-orbit logic devices using vdW interfaces.
自旋注入、输运以及在铁磁体与自旋承载通道之间的界面上进行检测，对于节能自旋逻辑器件而言至关重要。然而，界面电导失配、自旋退相以及低效的自旋-电荷转换显著降低了这些过程的效率。在本研究中，证明了由铁磁体（FeGeTe）和外尔半金属组成的全范德瓦尔斯异质结构能够实现高自旋读出效率。具体而言，实现了150 mΩ的非局域自旋读出信号和7.8 Ω的局域自旋读出信号，这达到了对实际自旋电子器件有用的信号水平。显著的自旋读出信号归因于范德瓦尔斯界面处自旋退相通道受到抑制、自旋扩散长度长以及T-MoTe中高效的电荷-自旋相互转换。这些发现突出了范德瓦尔斯异质结构在高效自旋霍尔效应自旋检测方面的潜力，为使用范德瓦尔斯界面的自旋轨道逻辑器件开辟了新可能性。
