Author(s): Zheng, YH (Zheng, Yuanhui); Ma, XL (Ma, Xiaolei); Yan, FG (Yan, Faguang); Lin, HL (Lin, Hailong); Zhu, WK (Zhu, Wenkai); Ji, Y (Ji, Yang); Wang, RS (Wang, Runsheng); Wang, KY (Wang, Kaiyou)

Source: NPJ 2D MATERIALS AND APPLICATIONS Volume: 6 Issue: 1 Article Number: 62 DOI: 10.1038/s41699-022-00339-z Published: SEP 8 2022

Abstract: Exploiting the spin degree of freedom to store and manipulate information provides a paradigm for future microelectronics. The development of van der Waals (vdW) heterostructures has created a fascinating platform for exploring spintronic properties in the two-dimensional (2D) limit. Transition-metal dichalcogenides such as tungsten diselenide (WSe2) have electronic band structures that are ideal for hosting many exotic spin-orbit phenomena. Here, we report the spin-filtering effect in all-vdW heterostructures with WSe2 barrier. Combining 2D-perpendicular magnetic anisotropy Fe3GeTe2 (FGT) with different thicknesses of WSe2, the FGT/WSe2/FGT spin valve shows distinct charge and spin transport behavior. Moreover, the negative magnetoresistance (-4.3%) could be inverted into positive magnetoresistance (up to +25.8%) with decreasing the WSe2 thickness. Furthermore, we proposed a spin-filtering model based on Delta-symmetry electrons tunneling to explain the crossover from negative to positive MR signal through ab initio calculation. These experimental and theoretical results illustrate the rich potential of the families of TMDC materials to control spin currents in 2D spintronic devices.

Accession Number: WOS:000852402100001

eISSN: 2397-7132

Full Text: https://www.nature.com/articles/s41699-022-00339-z