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arXiv · 2508.18746

Flexible orbital torque device with ultralow switching current

Liguang Gong·Jian Song·Bin Lao·Run-Wei Li·Zhiming Wang
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Abstract

Orbital torque (OT) offers a highly efficient way for electrical magnetization manipulation. However, its potential in the emerging field of flexible spintronics remains largely unexplored. Here, we demonstrate a flexible and robust OT device based on a mica/SrRuO3(SRO)/CoPt heterostructure. We measure a large torque efficiency of -0.31, which originates from the significant orbital Hall effect in the SRO layer. Leveraging the low thermal conductivity of the mica substrate, a thermally-assisted switching mechanism is activated, enabling an ultralow threshold current density of 9.2x109 A/m2. This value represents a 90% reduction compared to conventional spin-torque devices and a 52% reduction against its rigid counterpart on a SrTiO3 substrate. The superior performances is well-maintained after 103 bending cycles, conforming its exceptional flexibility and durability. Our work pioneers the development of flexible OT devices, showcasing a viable path toward next-generation, low-power wearable spintronic applications.

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Liguang Gong, Jian Song, Bin Lao, Run-Wei Li, Zhiming Wang. 2025-08-26. Flexible orbital torque device with ultralow switching current. https://arxiv.org/abs/2508.18746

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