Efficient Charge‐to‐Orbit Current Conversion for Orbital Torque Based Artificial Neurons and Synapses

Qian Zhao,Xuming Luo,Huiliang Wu,Bin He, Quwen Wang, Tengfei Zhang, Zimu Li, Pan Liu,Chenbo Zhao,Jianbo Wang,Qingfang Liu,Guoqiang Yu,Jinwu Wei

ADVANCED ELECTRONIC MATERIALS（2024）

Lanzhou Univ | Chinese Acad Sci | Tianfu Innovat Energy Estab

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Abstract

AbstractOrbital Hall effect (OHE) in light metal materials has attracted significant attention due to its potential applications in innovative orbitronic devices. Here, the OHE in titanium film is investigated and the orbital torque efficiency in Pt/[Co/Ni]3/Ti multilayers is characterized. A notable effective field per unit current density of orbital torque is achieved, nearing 560 Oe per 107 A cm−2 in a sample featuring 25 nm Ti layer. The corresponding orbital torque efficiency is ≈0.25. The resulting orbital torque effectively switches the perpendicularly magnetized moments in Co/Ni multilayers. In contrast, a reference sample of Pt/[Co/Ni]3/Pt demonstrates significantly lower switching efficiency. Furthermore, it is demonstrated that the multi‐states switching driven by orbital torque in Pt/[Co/Ni]3/Ti structure can mimic the behaviors of artificial neurons and synapses. This work not only enhances the understanding of the orbital torque but also offers the development of novel orbitronic devices based on OHE.

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Key words

artificial neuron and synapse,magnetization switching,orbital Hall effect,orbital torque

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