Terahertz Spin-Current Pulses from an Off-Resonant Antiferromagnet

被引：5
|
作者：
Sun, Chi [1 ,2 ]
Yang, Hyunsoo [1 ]
Brataas, Arne [2 ]
Jalil, Mansoor B. A. [1 ]
机构：
[1] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore
[2] Norwegian Univ Sci & Technol, Dept Phys, Ctr Quantum Spintron, NO-7491 Trondheim, Norway
来源：
PHYSICAL REVIEW APPLIED | 2022年 / 17卷 / 03期
基金：
新加坡国家研究基金会;
关键词：
MAGNETIZATION DYNAMICS;
D O I：
10.1103/PhysRevApplied.17.034028
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The generation of terahertz (THz) spin current is highly desired for enhancing the speed and efficiency of information manipulation by ultrafast spintronics. We develop an analytical model to investigate the coherent and pure spin-current pulses generated by spin pumping in a canted insulating antiferromagnet (AFM) system with Dzyaloshinskii-Moriya interaction (DMI). As expected, the spin pumping signal is significant at resonance. However, we also predict efficient THz spin-current transient with a magnitude comparable with that of its resonant counterparts in the much higher off-resonance THz frequency regime. Its ultrafast temporal change compensates for the suppression of the dynamic magnetization amplitudes at off-resonance. In addition, a stronger DMI field enhances the amplitude of the spin-current transient. Our results represent an efficient approach to generate coherent THz spin-current pulses based on canted AFM heterostructures without requiring a static magnetic field.
引用
收藏
页数：8
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