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Spin-orbit torque manipulation of sub-terahertz magnons in antiferromagnetic α-Fe2O3
Nature Communications ( IF 16.6 ) Pub Date : 2024-05-14 , DOI: 10.1038/s41467-024-48431-w
Dongsheng Yang , Taeheon Kim , Kyusup Lee , Chang Xu , Yakun Liu , Fei Wang , Shishun Zhao , Dushyant Kumar , Hyunsoo Yang

The ability to electrically manipulate antiferromagnetic magnons, essential for extending the operating speed of spintronic devices into the terahertz regime, remains a major challenge. This is because antiferromagnetic magnetism is challenging to perturb using traditional methods such as magnetic fields. Recent developments in spin-orbit torques have opened a possibility of accessing antiferromagnetic magnetic order parameters and controlling terahertz magnons, which has not been experimentally realised yet. Here, we demonstrate the electrical manipulation of sub-terahertz magnons in the α-Fe2O3/Pt antiferromagnetic heterostructure. By applying the spin-orbit torques in the heterostructure, we can modify the magnon dispersion and decrease the magnon frequency in α-Fe2O3, as detected by time-resolved magneto-optical techniques. We have found that optimal tuning occurs when the Néel vector is perpendicular to the injected spin polarisation. Our results represent a significant step towards the development of electrically tunable terahertz spintronic devices.



中文翻译:

反铁磁 α-Fe2O3 中亚太赫兹磁振子的自旋轨道扭矩操纵

电操纵反铁磁磁振子的能力对于将自旋电子器件的运行速度扩展到太赫兹范围至关重要,这仍然是一个重大挑战。这是因为使用磁场等传统方法来扰动反铁磁磁性具有挑战性。自旋轨道扭矩的最新进展为获取反铁磁磁序参数和控制太赫兹磁振子提供了可能性,但这尚未通过实验实现。在这里,我们演示了α -Fe 2 O 3 /Pt 反铁磁异质结构中亚太赫兹磁振子的电操纵。通过在异质结构中应用自旋轨道扭矩,我们可以改变磁振子色散并降低α -Fe 2 O 3中的磁振子频率,如时间分辨磁光技术检测到的。我们发现,当尼尔矢量垂直于注入的自旋极化时,会发生最佳调谐。我们的结果代表了朝着电可调太赫兹自旋电子器件的发展迈出的重要一步。

更新日期:2024-05-14
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