Nonlocal Spin Valves Based on Graphene/Fe3GeTe2 van der Waals Heterostructures

Abstract
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 Fe3GeTe2 (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.

Citation
He, X., Zhang, C., Zheng, D., Li, P., Xiao, J. Q., & Zhang, X. (2023). Nonlocal Spin Valves Based on Graphene/Fe3GeTe2 van der Waals Heterostructures. ACS Applied Materials & Interfaces. https://doi.org/10.1021/acsami.2c21918

Acknowledgements
This work was financially supported by King Abdullah University of Science and Technology (KAUST), Office of Sponsored Research (OSR) under Award Nos. ORA-CRG8-2019-4081 and ORA-CRG10-2021-4665.P.L. would like to thank the funding support from the National Natural Science Foundation of China (No. 12074056). J.Q.X. acknowledges the support from the US NSF under a grant number of DMR 1904076.

Publisher
American Chemical Society (ACS)

Journal
ACS Applied Materials & Interfaces

DOI
10.1021/acsami.2c21918

PubMed ID
36753695

Additional Links
https://pubs.acs.org/doi/10.1021/acsami.2c21918

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