发表机构
Norwegian University of Science and Technology（挪威科技大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文揭示太赫兹驱动下磁化动力学中的章动阻尼力矩，提出界面项产生与频率平方成正比的直流自旋泵浦，并通过散射方法预测超薄薄膜中的增强效应。
AI 中文摘要
在太赫兹驱动频率下，磁化动力学进入惯性区域，超出了标准Landau-Lifshitz-Gilbert（LLG）理论的适用范围。我们揭示了一种章动阻尼力矩，包含体项和界面贡献，后者描述了自旋向相邻金属的发射。界面项产生章动自旋泵浦：一种与驱动频率二次方成正比的直流自旋电流。利用散射方法，我们将此效应与微观材料参数联系起来，并预测在超薄薄膜和低费米能导体中会出现显著增强。章动自旋泵浦可以通过逆自旋霍尔效应直接检测，或通过章动阻尼的厚度依赖性重整化间接检测。
英文摘要
At terahertz drive frequencies, magnetization dynamics enter an inertial regime beyond the scope of standard Landau-Lifshitz-Gilbert (LLG) theory. We reveal a nutational damping torque comprising a bulk term and an interfacial contribution that describes spin emission into adjacent metals. The interfacial term generates nutational spin pumping: a dc spin current that scales quadratically with the drive frequency. Using a scattering approach, we relate this effect to microscopic material parameters and predict pronounced enhancements in ultrathin films and low-Fermi-energy conductors. Nutational spin pumping can be detected directly via the inverse spin Hall effect or indirectly via thickness-dependent renormalization of nutational damping.
Journal refHans Gløckner Giil and Arne Brataas, Nutational Spin Pumping and Dissipation, Phys. Rev. B 114, L140413 (2026)
