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Field-free spin-orbit torque magnetization switching in Pt/CoTb devices grown on flexible substrates for neuromorphic computing

Applied Physics Letters, ISSN: 0003-6951, Vol: 125, Issue: 18
2024
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Article Description

Flexible spintronic devices based on spin-orbit torque (SOT)-induced perpendicular magnetization switching (PMS) have attracted increasing attention due to their high storage intensity and good programming capability. However, to achieve deterministic PMS, an in-plane auxiliary magnetic field is required, which greatly limits its application. Here, we show that “robust” magnetic field-free SOT-driven PMS is realized in the oblique sputtered Pt/CoTb multilayers grown on a flexible polyimide substrate. “Robust” means the magnetic field-free SOT switching is highly repeatable and stable after 100 bending cycles under various bending conditions. Additionally, the fabricated flexible multilayers exhibit nearly linear and nonvolatile multistate plasticity as synapses and a nonlinear sigmoid activation function when acting as neurons. We construct a fully connected neural network for handwritten digit recognition, achieving an over 96.27% recognition rate. Our findings may spur further investigations on the SOT-based flexible spintronic devices for wearable artificial intelligence applications.

Bibliographic Details

Wei Wang; Chuanwei Feng; Yiheng Wang; Dong Wang; Yibo Fan; Xiang Han; Lihui Bai; Yanxue Chen; Yufeng Tian; Shishen Yan; Qikun Huang

AIP Publishing

Physics and Astronomy

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