论文标题
Terahertz Slonczewski在反铁磁性自旋 - 纳米振荡器中传播旋转波和大输出电压
Terahertz Slonczewski propagating spin waves and large output voltage in antiferromagnetic spin-Hall nano-oscillators
论文作者
论文摘要
我们研究了理论上的抗铁磁铁（AFM）自旋式纳米振荡器（SHNOS），该纳米振荡器（SHNOS）由薄膜单轴AFM中的纳米收缩（NC）组成。通过求解派生的SW方程，我们以类似于基于Ferromagnet的Shno的Slonczewski SWS的Thz频率径向传播自旋波（SWS）。我们预测最新的纳米技术可访问的特定NC半径的最小阈值电流。交换相互作用增强了AFMS的自旋泵化导致厚度依赖性阈值频率。我们表明，单轴AFMS通过自旋泵化产生AC电场，该泵比双轴AFMS大三个数量级。我们的工作增强了对AFM-SHHOS中电流驱动的SW的基本理解，并可以根据材料选择，设备几何形状和频率可调性优化实用设备。传播的SWS在瞄准高功率时提供了远程THZ信号的产生和有效的SHNOS同步手段。
We study theoretically antiferromagnet (AFM) based spin-Hall nano-oscillators (SHNOs) consisting of a nano-constriction (NC) in a thin-film uniaxial AFM. By solving the derived SW equation we evidence radially propagating spin waves (SWs) at THz frequencies similar to the Slonczewski SWs known at GHz frequencies for a ferromagnet-based SHNO. We predict a minimum threshold current for a specific NC radius accessible by the state-of-the-art nanotechnology. The exchange interaction enhanced spin pumping for AFMs leads to a strong thickness dependent threshold frequency. We show that the uniaxial AFMs generate ac electrical fields via spin pumping that are three orders of magnitude larger than reported for biaxial AFMs. Our work enhances the fundamental understanding of current-driven SWs in AFM-SHNOs and enables optimization of practical devices in terms of material choice, device geometry, and frequency tunability. The propagating SWs offer remote THz signal generation and an efficient means for synchronization of SHNOs when aiming at high power.
