旋转轨道扭矩驱动的太赫兹振荡在Pt/KFe3(OH)6(SO4)2/W三层结构
Boshi Mu1, Xiaofeng Cheng1, Yan Liu1
1College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China.
The journal of physical chemistry letters
|February 17, 2026
概括
我们开发了一个纳米级的太赫兹 (THz) 发电机,使用Pt/KFe3(OH) 6(SO4) 2/W结构. 该装置通过直流驱动产生稳定的THz信号,利用反铁磁体中的旋转轨道扭矩.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 这就是Spintronics.
背景情况:
- 太赫兹 (THz) 信号生成对于先进的光谱和通信至关重要.
- 现有的THz源往往需要复杂的设置或高功耗.
- 反铁磁材料由于其独特的磁性特性,为新型自旋电子设备提供了潜力.
研究的目的:
- 提出和演示一个新的纳米级THz信号发生器.
- 在反铁磁材料中利用旋转轨道扭矩 (SOT) 进行THz发射.
- 为了建立一个直流驱动的,稳定的THz源与调节频率控制.
主要方法:
- 一个Pt/KFe3(OH) 6(SO4) 2/W三层结构的制造.
- 利用来自Pt的自旋电流在KFe3(OH) 6(SO4) 2.2.中产生SOT.
- 在反铁磁铁中激发稳定的磁化振荡.
- 在W.中通过反旋转霍尔效应 (ISHE) 检测THz交流信号.
- 使用微磁模拟和理论分析.
主要成果:
- 在直流驱动下实现稳定的THz输出.
- 使用不对称的重金属/AFM/重金属配置,证明了高效的旋转电流注入和信号读取.
- 确定了不对称的Dzyaloshinskii-Moriya相互作用 (DMI) 能量分布作为THz信号的起源.
- 建立了激发电流和THz信号输出之间的定量关系.
- 通过降低值电流实现了可调节的频率控制.
结论:
- 拟议的Pt/KFe3(OH) 6(SO4) 2/W结构是一个可行的纳米级THz信号发生器.
- 反铁磁体中的SOT驱动的磁化动力学可以有效地产生THz辐射.
- 优化材料和结构参数允许可调节的THz产生.
- 这项工作为紧和高效的THz源开辟了道路.
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