Fe薄膜中产生太赫兹波的微磁学模拟过程  

Process of Generating Terahertz Waves in Fe Thin Film Simulated by Using Micromagnetic

作　　者：周一玮 任一凡 刘立旺 缪雨萱 王璐 ZHOU Yiwei;REN Yifan;LIU Liwang;MIAO Yuxuan;WANG Lu(School of Teacher Education,Nanjing University of Information Science and Technology,Nanjing 210044,China;Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Science Island Branch,Graduate School of University of Science and Technology of China,Hefei 230026,China;School of Physics and Optoelectronic Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学教师教育学院,南京210044 [2]中国科学院合肥物质科学研究院,合肥230031 [3]中国科学技术大学研究生院科学岛分院,合肥230026 [4]南京信息工程大学物理与光电工程学院,南京210044

出　　处：《真空科学与技术学报》2024年第11期993-999,共7页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金项目(11804163);南京信息工程大学人才启动项目(2243141601035);2023年江苏省高等教育教改研究立项课题(2023JSJG147);2024年度教育部高等学校大学物理课程教学指导委员会大中物理教育衔接工作委员会教学研究课题(WX202439);2024年江苏省高校“高质量公共课教学改革研究”专项课题(2024GZJX015)。

摘　　要：太赫兹辐射的独特特性使其成为一种多功能工具,被应用于成像、光谱学、通信、材料科学和生物医学等各个领域。通过基于Landau Lifshitz Gilbert方程的微磁学模拟研究了微磁学领域中的一维自旋波的色散关系、磁畴壁和热效应下的磁矩统计分布,在此基础上又结合三温度模型模拟了飞秒激光作用于Fe薄膜后产生太赫兹波的过程。模拟产生的太赫兹波的电场强度的分量E_(y)在0.3 ps时达到了最大值,由辐射电场的频谱可以看出辐射的电场强度的E_(y)分量的频谱连续性较好,没有突变或间断。The unique characteristics of terahertz radiation make it a multifunctional tool that can be applied in various fields such as imaging,spectroscopy,communication,materials science,and biomedical applications.In this paper,the dispersion relationship of one-dimensional spin waves,magnetic domain walls,and statistical distribution of magnetic moments under thermal effects in the field of micromagnetics are studied through micromagnetic simulations based on the Landau-Lifshitz-Gilbert equation.Based on these,the three-temperature model is combined to simulate the process of terahertz waves generated by femtosecond laser irradiation on Fe thin film.The component of the electric field intensity of the simulated terahertz wave reached its maximum value at 0.3 ps.From the spectrum of the radiated electric field,it can be seen that the spectral continuity in the y-direction of the radiated electric field intensity is good,without any abrupt changes or interruptions.

关 键 词：飞秒激光 微磁学 太赫兹 LLG 方程 

分 类 号：O439[机械工程—光学工程] O469[理学—光学]