Mimicking synaptic plasticity with wedged Pt/Co/Pt spin-orbit torque device

Shiwei Chen; Mishra Rahul; Huanjian Chen; Hyunsoo Yang; Xuepeng Qiu

doi:10.1088/1361-6463/ac33d9

Mimicking synaptic plasticity with wedged Pt/Co/Pt spin-orbit torque device

Applied Physics 2024-09-11 v1 Materials Science

Authors: Shiwei Chen , Mishra Rahul , Huanjian Chen , Hyunsoo Yang , Xuepeng Qiu

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Abstract

We fabricated a wedge-shaped Pt/Co/Pt device with perpendicular magnetic anisotropy and manifested that the Co magnetization can be solely switched by spin-orbit torque without any magnetic field. Similar to the synaptic weight, we observed that the state of Co magnetization (presented by the anomalous Hall resistance RH) of the wedged Pt/Co/Pt device can be tuned continuously with a large number of nonvolatile levels by applied pulse currents. Furthermore, we studied the synaptic plasticity of the wedged Pt/Co/Pt device, including the excitatory postsynaptic potentials or inhibitory postsynaptic potentials and spiking-time-dependent plasticity. The work elucidates the promise of the wedged Pt/Co/Pt device as a candidate for a new type of artificial synaptic device that is induced by a spin current and paves a substantial pathway toward the combination of spintronics and synaptic devices.

Keywords

neuromorphic computing

Cite

@article{arxiv.2409.06286,
  title  = {Mimicking synaptic plasticity with wedged Pt/Co/Pt spin-orbit torque device},
  author = {Shiwei Chen and Mishra Rahul and Huanjian Chen and Hyunsoo Yang and Xuepeng Qiu},
  journal= {arXiv preprint arXiv:2409.06286},
  year   = {2024}
}

Mimicking synaptic plasticity with wedged Pt/Co/Pt spin-orbit torque device

Abstract

Keywords

Cite

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