Incorporating magneto-crystalline anisotropy and damping in the autoresonance oscillations modeling in thin YIG films

IF 2.9 3区数学 Q1 MATHEMATICS, APPLIED Physica D: Nonlinear Phenomena Pub Date : 2024-12-01 Epub Date: 2024-09-28 DOI:10.1016/j.physd.2024.134386

V. Teplov, V. Bessonov, V. Bessonova, A. Telegin

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Abstract

Micromagnetic modeling of non-linear autoresonance magnetization oscillations in thin films of yttrium iron garnet (YIG) with specified growth directions is conducted. It is found that in the case of rapid frequency modulation (sweep rate of the order of 1016 Hz/sec) of 1Oe excitation magnetic field, the maximum precession angle of magnetization can achieve up to 160°. For the first time, the influence of demagnetization fields, magneto-crystalline anisotropy, and Gilbert damping on autoresonance phenomena in YIG films is numerically calculated. It is shown that demagnetization fields and damping have a weak influence on parameters of autoresonance. Simultaneously, damping provides a shorter phase-locking time between the excitation field and intrinsic magnetization oscillations in the film, favoring high amplitude of magnetization oscillations. The magneto-crystalline anisotropy leads to a reduction of the threshold sweep rate of the pumping field for YIG films with [100] direction, as well as the emergence of parametric instability for [210] films. The results of the work are aimed to be applied for the experimental observation of autoresonance phenomena in thin yttrium iron garnet films.

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将磁晶各向异性和阻尼纳入 YIG 薄膜的自共振振荡模型中

对具有特定生长方向的钇铁石榴石（YIG）薄膜中的非线性自共振磁化振荡进行了微磁建模。研究发现，在 1Oe 励磁磁场的快速频率调制（扫描速率为 1016 Hz/秒）情况下，磁化的最大前驱角可达到 160°。研究人员首次用数值计算了去磁场、磁晶各向异性和吉尔伯特阻尼对 YIG 薄膜自共振现象的影响。结果表明，去磁场和阻尼对自共振参数的影响较弱。同时，阻尼可缩短激励场与薄膜固有磁化振荡之间的锁相时间，有利于产生高振幅的磁化振荡。磁晶各向异性导致具有[100]方向的 YIG 薄膜抽运磁场的阈值扫描速率降低，以及[210]方向薄膜参数不稳定性的出现。该研究成果旨在应用于钇铁石榴石薄膜自共振现象的实验观测。

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来源期刊

Physica D: Nonlinear Phenomena 物理-物理：数学物理

CiteScore

7.30

自引率

7.50%

发文量

213

审稿时长

65 days

期刊介绍： Physica D (Nonlinear Phenomena) publishes research and review articles reporting on experimental and theoretical works, techniques and ideas that advance the understanding of nonlinear phenomena. Topics encompass wave motion in physical, chemical and biological systems; physical or biological phenomena governed by nonlinear field equations, including hydrodynamics and turbulence; pattern formation and cooperative phenomena; instability, bifurcations, chaos, and space-time disorder; integrable/Hamiltonian systems; asymptotic analysis and, more generally, mathematical methods for nonlinear systems.