Vertical WS2 spin valve with Ohmic property based on Fe3GeTe2 electrodes

doi:10.1088/1674-1056/ac078b

Abstract The two-dimensional (2D) transition-metal dichalcogenides (TMDCs) have been recently proposed as a promising class of materials for spintronic applications. Here, we report on the all-2D van der Waals (vdW) heterostructure spin valve device comprising of an exfoliated ultra-thin WS₂ semiconductor acting as the spacer layer and two exfoliated ferromagnetic Fe₃GeTe₂ (FGT) metals acting as ferromagnetic electrodes. The metallic interface rather than Schottky barrier is formed despite the semiconducting nature of WS₂, which could be originated from the strong interface hybridization. The spin valve effect persists up to the Curie temperature of FGT. Moreover, our metallic spin valve devices exhibit robust spin valve effect where the magnetoresistance magnitude does not vary with the applied bias in the measured range up to 50 μA due to the Ohmic property, which is a highly desirable feature for practical application that requires stable device performance. Our work reveals that WS₂-based all-2D magnetic vdW heterostructure, facilitated by combining 2D magnets, is expected to be an attractive candidate for the TMDCs-based spintronic applications.

Keywords: WS₂ Fe₃GeTe₂ spin valve effect Ohmic property

Received: 25 February 2021
Revised: 22 March 2021
Accepted manuscript online: 03 June 2021

PACS:	75.70.Cn	(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
	85.75.Bb	(Magnetic memory using giant magnetoresistance)
	72.25.Mk	(Spin transport through interfaces)

Fund: Project supported by the National Key R&D Program of China (Grant No. 2017YFA0303400), the National Natural Science Foundation of China (Grant No. 61774144), Beijing Natural Science Foundation Key Program (Grant No. Z190007), and Chinese Academy of Sciences (Grant Nos. QYZDY-SSW-JSC020, XDB44000000, and XDB28000000).

Corresponding Authors: Kaiyou Wang
E-mail: kywang@semi.ac.cn

Cite this article:

Ce Hu(胡策), Faguang Yan(闫法光), Yucai Li(李予才), and Kaiyou Wang(王开友) Vertical WS₂ spin valve with Ohmic property based on Fe₃GeTe₂ electrodes 2021 Chin. Phys. B 30 097505

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Vertical WS2 spin valve with Ohmic property based on Fe3GeTe2 electrodes

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Vertical WS₂ spin valve with Ohmic property based on Fe₃GeTe₂ electrodes