【摘要】 基于铁磁金属Ni₈₀Fe₂₀与非磁性金属Pt异质结构的自旋太赫兹源，通过加载电流密度不同的电流，可实现对太赫兹波幅值的调制。通过引线键合将自旋太赫兹源与印刷电路板连接，通过电流源加载不同大小的电流，在太赫兹时域光谱系统内收集自旋太赫兹源辐射的电磁信号。由于电流施加在自旋太赫兹源上会产生焦耳热，热量积累引起温度升高，铁磁材料的饱和磁化随温度的升高而降低。太赫兹波幅值受铁磁层饱和磁化的影响，幅值随外加电流的增大而减小，最终实现自旋太赫兹源的信号产生及电调制。在0.1～2.8 THz的频率范围内，实现了约59%的调制深度。通过理论推导，太赫兹发射幅值与外加电流密度的三次方呈线性相关，实验数据的曲线拟合结果证实了这一点。电调制这一方法有利于自旋太赫兹源的集成化发展，丰富了现有对自旋太赫兹源的调控手段，为理解自旋太赫兹源的工作原理提供了全新的方法。更多还原

【Abstract】 Based on a spintronic terahertz source employing a heterostructure of ferromagnetic metal Ni₈₀Fe₂₀ and non-magneticmetal Pt, the amplitude of terahertz waves can be modulated by applying currents with different current densities. The spintronic terahertz source is connected to a Printed Circuit Board（PCB） via wire bonding. By applying various magnitudes of current through a current source, the electromagnetic signals radiated from the spintronic terahertz source are collected within a Terahertz Time-Domain Spectroscopy（THz-TDS） system. Since current application generates Joule heating in the spintronic terahertz source, heat accumulation leads to temperature rise, which reduces the saturation magnetization of the ferromagnetic material. The terahertz amplitude, influenced by the saturation magnetization of the ferromagnetic layer, decreases with increasing applied current, thereby achieving both signal generation and electrical modulation of the spintronic terahertz source. A modulation depth of approximately 59% is realized across the frequency range of 0.1～2.8 THz. Theoretical derivation reveals that the terahertz emission amplitude is linearly proportional to the cube of the applied current density, which is confirmed by curve fitting of experimental data. This electrical modulation method facilitates the integrated development of spintronic terahertz sources, enriches existing control approaches, and provides a novel pathway for understanding the operational mechanism of spintronic terahertz sources.更多还原