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Applied Physics 2023
Gilbert阻尼作用下形变铁氧体中的磁孤子传播
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Abstract:
本文研究了电磁超短波在(1 + 1)维Gilbert阻尼存在时的形变铁氧体中的传播。我们从麦克斯韦方程和朗道–利夫希茨–吉尔伯特方程出发，通过多重尺度展开方法推导出一个广义的超短波模型。通过数值模拟，研究了不同类型的非均匀交换作用和Gilbert阻尼共同作用对磁孤子传播的影响。结果表明，在Gilbert阻尼作用下，磁孤子能量逐渐耗散，直至消失。磁孤子的耗散可以通过调控局域非均匀交换作用函数，实现选择性局域位置耗散减弱。通过设置局域线性非均匀交换作用，可以在整体上一定程度地减弱孤子的这种能量耗散。
In this paper, we study in detail the propagation of electromagnetic ultrashort waves in a deformed ferrite in the presence of Gilbert damping. We derive a generalized ultrashort-wave model from the Maxwell’s equation supplemented by the Landau-Lifshitz-Gilbert equation by means of a multiscale scheme. Numerical simulations are performed to study the effects of different types of inhomogeneous exchange effect and Gilbert damping on the propagation of magnetic solitons. The results show that under the effect of Gilbert damping, the magnetic soliton energy is gradually dissipated until it disappears. However, the dissipation of magnetic solitos can be reduced selec-tively by adjusting a localized inhomogeneous exchange effect function. By setting the localized linear inhomogeneous exchange effect, this energy dissipation of the soliton can be reduced to a certain extent as a whole.
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