Yang Yuhe, Wang Ping, Chen Jiali, Zhang Delin, Pan Chang, Hu Shuai, Wang Ting, Yue Wensi, Chen Cheng, Jiang Wei, Zhu Lujun, Qiu Xuepeng, Yao Yugui, Li Yue, Wang Wenhong, Jiang Yong
School of Material Science and Engineering, Tiangong University, Tianjin, 300387, China.
Institute of Quantum Materials and Devices, School of Electronics and Information Engineering, Tiangong University, Tianjin, 300387, China.
Nat Commun. 2024 Oct 5;15(1):8645. doi: 10.1038/s41467-024-52824-2.
The orbital Hall effect in light materials has attracted considerable attention for developing orbitronic devices. Here we investigate the orbital torque efficiency and demonstrate the switching of the perpendicularly magnetized materials through the orbital Hall material, i.e., Zr. The orbital torque efficiency of approximately 0.78 is achieved in the Zr orbital Hall material with the perpendicularly magnetized [Co/Pt] sample, which significantly surpasses that of the perpendicularly magnetized CoFeB/Gd/CoFeB sample (approximately 0.04). Such a notable difference is attributed to the different spin-orbit correlation strength between the [Co/Pt] sample and the CoFeB/Gd/CoFeB sample, confirmed through theoretical calculations. Furthermore, the full magnetization switching of the [Co/Pt] samples with a switching current density of approximately 2.6×10A/cm has been realized through Zr, which even outperforms that of the W spin Hall material. Our finding provides a guideline to understand orbital torque efficiency and paves the way for developing energy-efficient orbitronic devices.
轻质材料中的轨道霍尔效应因轨道电子学器件的发展而备受关注。在此，我们研究了轨道转矩效率，并演示了通过轨道霍尔材料（即Zr）实现垂直磁化材料的切换。在具有垂直磁化的[Co/Pt]样品的Zr轨道霍尔材料中实现了约0.78的轨道转矩效率，这显著超过了垂直磁化的CoFeB/Gd/CoFeB样品（约0.04）。通过理论计算证实，这种显著差异归因于[Co/Pt]样品与CoFeB/Gd/CoFeB样品之间不同的自旋-轨道相关强度。此外，通过Zr实现了[Co/Pt]样品在约2.6×10A/cm的切换电流密度下的全磁化切换，其性能甚至优于W自旋霍尔材料。我们的发现为理解轨道转矩效率提供了指导，并为开发节能轨道电子学器件铺平了道路。
