太赫兹科学与电子信息学报2026，Vol.24Issue(2)：251-257,7.DOI:10.11805/TKYDA2025197
基于自旋源Ni80Fe20/Pt的太赫兹信号产生及电调制
Terahertz signal generation and electrical modulation based on spintronic terahertz emitter Ni80Fe20/Pt
摘要
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.关键词
自旋太赫兹源/镍铁合金/电调制/热效应/饱和磁化Key words
spintronic terahertz emitter/permalloy/electrical modulation/thermal effect/saturation magnetization分类
数理科学引用本文复制引用
李桐,田达,张彩虹,吴敬波,范克彬,金飚兵,陈健,吴培亨..基于自旋源Ni80Fe20/Pt的太赫兹信号产生及电调制[J].太赫兹科学与电子信息学报,2026,24(2):251-257,7.基金项目
国家自然科学基金资助项目(62222106 （）
62288101 （）
62027807 （）
92163216 （）
92463308 （）
62071217 （）
62275118) （）
