Orbital 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.

中文翻译：

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基于轨道扭矩的人工神经元和突触的高效电荷到轨道电流转换


轻金属材料中的轨道霍尔效应 （OHE） 因其在创新轨道装置中的潜在应用而引起了广泛关注。在这里，研究了钛膜中的 OHE，并表征了 Pt/[Co/Ni]3/Ti 多层膜中的轨道扭矩效率。在具有 25 nm Ti 层的样品中，实现了轨道扭矩的每单位电流密度的显着有效磁场，接近每 107 A cm-2 560 Oe。相应的轨道扭矩效率为 ≈0.25。由此产生的轨道扭矩有效地切换了 Co/Ni 多层中的垂直磁化矩。相比之下，Pt/[Co/Ni]3/Pt 的参考样品显示出明显较低的开关效率。此外，研究表明 Pt/[Co/Ni]3/Ti 结构中由轨道扭矩驱动的多态切换可以模拟人工神经元和突触的行为。这项工作不仅增强了对轨道扭矩的理解，还为基于 OHE 的新型轨道装置的开发提供了机会。