Room-temperature and tunable tunneling magnetoresistance in Fe3GaTe2-based all-2D van der Waals heterojunctions with high spin polarization

Abstract

Magnetic tunnel junctions (MTJs) based on all-two dimensional (2D) van der Waals heterostructures with sharp and clean interfaces in atomic scale are essential for the application of next-generation spintronics. However, the lack of room-temperature intrinsic ferromagnetic crystals with perpendicular magnetic anisotropy has greatly hindered the development of vertical MTJs. The discovery of room-temperature intrinsic ferromagnetic 2D crystal Fe3GaTe2 has solved the problem and greatly facilitated the realization of practical spintronic devices. Here, we demonstrate a room-temperature MTJ based on Fe3GaTe2/WS2/Fe3GaTe2 heterostructure. The tunnelling magnetoresistance (TMR) ratio is up to 213% with high spin polarization of 72% at 10 K, the highest ever reported in Fe3GaTe2-based MTJs up to now. The tunnelling spin-valve signal robustly exists at room temperature (300 K) with bias current down to 10 nA. Moreover, the spin polarization can be modulated by bias current and the TMR shows a sign reversal at large bias current. Our work sheds light on the potential application for low-energy consumption all-2D vdW spintronics and offers alternative routes for the electronic control of spintronic devices.

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• Van der Waals heterostructures for spintronics and opto-spintronics
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• Tremendous tunneling magnetoresistance effects based on van der Waals room-temperature ferromagnet Fe${}_3$GaTe${}_2$ with highly spin-polarized Fermi surfaces

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• Spectral Evidence for Local-Moment Ferromagnetism in van der Waals Metals Fe${}_3$GaTe${}_2$ and Fe${}_3$GeTe${}_2$
• Above-room-temperature intrinsic ferromagnetism in ultrathin van der Waals crystal Fe${}_{3+x}$GaTe${}_2$
• Above-room-temperature ferromagnetism in large-area epitaxial Fe3GaTe2/graphene van der Waals heterostructures
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• Microscopic mechanisms of Strong Electron Scattering and Giant Anomalous Hall Effect in high-Curie-temperature Fe3GaTe2 van der Waals Films
• Interface-Controlled Antiferromagnetic Tunnel Junctions based on a metallic van der Waals A-type Antiferromagnet
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• Robustness of ferromagnetism in van der Waals magnet Fe${}_3$GeTe${}_2$ to hydrostatic pressure
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