Electrodynamic Model of THz- Frequency Signal Source Based on Antiferromagnetic Spin Hall Auto-oscillator

O. Sulymenko, O. Prokopenko
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Abstract

Electrodynamic model of a THz-frequency signal source utilizing an antiferromagnetic spin Hall oscillator (SHO), where the magnetization vectors of the antiferromagnet's (AFM) sublattices are canted inside the easy plane, resulting in the appearance of the small net magnetization vector, is proposed and analyzed. A bias dc electric current applied to the SHO creates a spin current that, being injected in the AFM layer, starts to rotate the net magnetization of the canted AFM with the THz frequency proportional to the injected spin current. This rotation of the small net magnetization results in the THz-frequency dipolar radiation that can be directly registered by an adjacent resonator. Our calculations show that the radiation power increases with the increase of frequency $f$ and could exceed $1 \mu W$ at $f$ ~ 0.5 THz for the case of a high-quality dielectric resonator coupled to the AFM layer.
基于反铁磁自旋霍尔振荡器的太赫兹频率信号源的电动力学模型
提出并分析了利用反铁磁自旋霍尔振荡器(SHO)的太赫兹频率信号源的电动力学模型,其中反铁磁(AFM)亚晶格的磁化矢量在易平面内倾斜,导致小净磁化矢量的出现。施加于SHO的偏压直流电流产生自旋电流,该电流注入AFM层后,开始旋转倾斜AFM的净磁化强度,其太赫兹频率与注入的自旋电流成正比。这种小净磁化的旋转导致太赫兹频率的偶极辐射,可以由相邻的谐振器直接记录。我们的计算表明,辐射功率随着频率f的增加而增加,并且在f ~ 0.5 THz时,高质量介电谐振器耦合到AFM层的辐射功率可以超过1 μ W。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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