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

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.