铁磁共振下均匀磁化强度的惯性动力学  

Inertial Dynamics of Uniform Magnetization in Ferromagnetic Resonance

作　　者：屈川 南雪萌 李再东 QU Chuan;NAN Xuemeng;LI Zaidong(Tianjin Key Laboratory of Quantum Optics and Intelligent Photonics,School of Sciences,Tianjin University of Technology,Tianjin300384,China;State Key Laboratory of Quantum Optics and Quantum Optics Devices,Shanxi University,Taiyuan 030006,China)

机构地区：[1]天津理工大学理学院天津市量子光学与智能光子学重点实验室,天津300384 [2]山西大学量子光学与光量子器件国家重点实验室,山西太原030006

出　　处：《山西大学学报（自然科学版）》2024年第1期171-178,共8页Journal of Shanxi University(Natural Science Edition)

基　　金：量子光学与光量子器件国家重点实验室开放课题(KF202203)。

摘　　要：本文通过惯性Landau-Lifshitz-Gilbert方程研究了铁磁体中的磁化强度动力学。在相同的初值条件,通过施加两种不同的电流,对该方程进行了理论分析和数值模拟。结果表明:当给定两种不同电流时,极角、极角速度、方向角和方向角速度振动的总体趋势都随着时间逐渐趋于平稳,并没有因外加电流不同而受到影响。此外,施加沿z轴方向的电流时,发现在长时间尺度上由惯性项所引起的各个磁化分量的进动振荡几乎是一条直线。最后,使用外加正弦含时电流,发现除正常的进动共振峰外,还存在惯性效应导致的章动共振峰。In this paper,the dynamics of magnetization in ferromagnets is studied by using the inertial Landau-Lifshitz-Gilbert equation.Under the same initial conditions,the equation is analyzed theoretically and simulated numerically by applying two different currents.The results show that when two different currents are given,the overall trend of pole angle,pole angular velocity,direction angle and direction angular velocity vibration tends to be stable with time,and is not affected by different applied currents.In addition,when the current along the z-axis is applied,it is found that the precession oscillation of each magnetization component caused by the inertia term is almost a straight line on a long time scale.Finally,using the applied sinusoidal time-dependent current,it is found that besides the normal precession resonance peak,there is also nutation resonance peak caused by inertial effect.

关 键 词：磁化强度动力学 惯性Landau-Lifshitz-Gilbert方程 章动 

分 类 号：O441.2[理学—电磁学]