Current-Controllable and Reversible Multi-Resistance-State Based on Domain Wall Number Transition in 2d Ferromagnet Fe 3 GeTe 2 .

Controlling the multi-state switching is significantly essential for the extensive utilization of 2D ferromagnet in magnetic racetrack memories, topological devices, and neuromorphic computing devices. The development of all-electric functional nanodevices with multi-state switching and a rapid reset remains challenging. Herein, to imitate the potentiation and depression process of biological synapses, a full current strategy is unprecedently established by the controllable resistance-state switching originating from the spin configuration rearrangement of domain wall number modulation in Fe 3 GeTe 2 . In particular, a strong correlation is uncovered in the reduction of domain wall number with the corresponding resistance decreasing by in-situ Lorentz transmission electron microscopy. Interestingly, the magnetic state is reversed instantly to the multi-domain wall state under a single pulse current with a higher amplitude, attributed to the rapid thermal demagnetization by simulation. Based on the neuromorphic computing system with full-current-driven artificial FGT synapses with multi-state switching, a high accuracy of ∼91% is achieved in the handwriting image recognition pattern. The results identify 2D ferromagnet as an intriguing candidate for future advanced neuromorphic spintronics. This article is protected by copyright. All rights reserved.