皮秒全电垂直磁化翻转
Picosecond all-electrical perpendicular magnetization switching.
摘要(中文译文)
电流诱导的自旋轨道矩（SOT）是操控自旋电子器件中磁态的有效方法。近期研究表明，皮秒级电脉冲可以诱导相干磁化翻转，将翻转时间从纳秒量级缩短至皮秒量级。然而，在垂直磁各向异性体系中，是否能够在不施加外磁场的情况下实现这种超快翻转仍不清楚。在此，我们展示了CoTb/Ti/CoFeB/MgO异质结构中的皮秒级全电学磁化翻转，其中面内磁化的CoTb层作为SOT源，同时产生面内自旋流σ和面外自旋流σ。Tb中强自旋轨道耦合显著增强了SOT效率，使得在100×100 nm²器件中实现16 ps翻转，预计能耗为41 fJ/bit。微磁学模拟和数值分析揭示了脉冲宽度与能耗之间的权衡关系，并确定了实现高能效翻转的最佳σ/σ比。我们的工作将自旋电子器件的频率推向太赫兹（THz）范围。
Abstract
Current-induced spin-orbit torque (SOT) is an effective approach to manipulate magnetic states in spintronic devices. Recent studies show picosecond electrical pulses can induce coherent magnetization switching, reducing switching time from nanosecond scale to picosecond scale. However, it remains unclear whether such ultrafast switching can be achieved in a perpendicular magnetic anisotropy system without an external magnetic field. Here, we demonstrate picosecond all-electrical magnetization switching in a CoTb/Ti/CoFeB/MgO heterostructure, where the in-plane magnetized CoTb layer acts as the SOT source, generating simultaneously in-plane spin current σ and out-of-plane spin current σ. The strong spin-orbit coupling in Tb significantly enhances the SOT efficiency, enabling 16 ps switching with projected 41 fJ/bit consumption in a 100×100 nm² device. Micromagnetic simulations and numerical analysis reveal trade-off between pulse width and energy consumption and identify an optimal σ/σ ratio for energy-efficient switching. Our work promotes the frequency of spintronic devices toward THz regime.
如何引用
AMA
Yu He, Chen Xiao, Kelian Lin, Kun Zhang, Boyu Zhang, Zhenyi Zheng, et al. Picosecond all-electrical perpendicular magnetization switching.. Nature communications. 2026; doi:10.1038/s41467-026-72582-7.
APA
Yu He, Chen Xiao, Kelian Lin, Kun Zhang, Boyu Zhang, Zhenyi Zheng, et al (2026). Picosecond all-electrical perpendicular magnetization switching.. Nature communications. https://doi.org/10.1038/s41467-026-72582-7
GB/T 7714
Yu He, Chen Xiao, Kelian Lin, Kun Zhang, Boyu Zhang, Zhenyi Zheng, et al. Picosecond all-electrical perpendicular magnetization switching.[J]. Nature communications, 2026 doi:10.1038/s41467-026-72582-7.
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