Gate-tunable exchange bias effect in FePS3-Fe5GeTe2 van der Waals heterostructures

Abstract

Electrical gate-manipulated exchange bias (EB) effect is a long-term goal for spintronics applications. Meanwhile, the emergence of van der Waals (vdW) magnetic heterostructures provides ideal platforms for the study of interlayer magnetic coupling. However, to date, the electrical gate-controlled EB effect has yet to be realized in vdW heterostructures. Here, for the first time, we realized electrically-controllable EB effects in a vdW antiferromagnetic (AFM)-ferromagnetic (FM) heterostructure, FePS3-Fe5GeTe2. For pristine FePS3-Fe5GeTe2 heterostructures, sizable EB effects can be generated due to the strong interface coupling, which also depend on the thickness of the ferromagnetic layers. By applying a solid protonic gate, the EB effects can be electrically tuned largely by proton intercalations and deintercalations. The EB field reaches up to 23% of the coercive field and the blocking temperature exceeds 50 K at Vg= -3.15 V. The proton intercalations not only tune the average magnetic exchange coupling, but also change the AFM configurations and transform the heterointerface between an uncompensated AFM-FM interface and a compensated AFM-FM interface. These alterations result in a dramatic modulation of the total interface exchange coupling and the resultant EB effects. The study is a significant step towards vdW heterostructure-based magnetic logic for future low-energy electronics.

19 pages, 5 figures

References in corpus (6)

• 2D materials and van der Waals heterostructures
• Magnetic 2D materials and heterostructures
• Ising-Type Magnetic Ordering in Atomically Thin FePS3
• Robust isothermal electric switching of interface magnetization: A route to voltage-controlled spintronics
• Van der Waals heterostructures for spintronics and opto-spintronics
• Gate-Tuned Interlayer Coupling in van der Waals Ferromagnet Fe${}_3$GeTe${}_2$ Nanoflakes

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• Configurable antiferromagnetic domains and lateral exchange bias in atomically thin CrPS4
• Strain-induced interlayer magnetic coupling spike of two-dimensional van der Waals material Fe${}_5$GeTe${}_2$
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