混沌域壁运动的分岔图与能量损失

H. Okuno;T. Homma
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引用次数: 1

摘要

基于微分方程的计算机模拟证明了畴壁的混沌振荡,该微分方程包括非线性恢复力和涡流阻尼项。混沌振荡涉及不规则现象(磁记录系统中的误差或噪声)和能量损失。磁畴壁运动的分岔图是研究混沌行为的一种有用方法。外部磁场是磁性器件设计中的一个重要参数。针对外磁场的振幅,计算了壁速度的分岔图。通向混沌的途径是通过周期1振荡的周期2、3、4和5的分叉。周期窗口和混沌区域交替出现。计算了磁畴壁运动引起的能量损失;混沌运动的能量损失值大于规则运动的能量损耗值,尽管它们具有相同的阻尼系数。因此,混沌运动是导致能量损失增加的一种新机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bifurcation Diagram and Energy Loss of Chaotic Domain-Wall Motion
Chaotic oscillation of a domain wall is demonstrated by computer simulations based on a differential equation which includes terms for the nonlinear force of restitution and eddy current damping. Chaotic oscillation involves irregular phenomena (the error or noise in magnetic recording systems) and energy losses. Bifurcation diagrams of magnetic domain-wall motion is a useful method for investigating chaotic behavior. The external magnetic field is an important parameter in the design of magnetic devices. The bifurcation diagram of the wall velocity is calculated for the amplitude of the external magnetic field. The route to chaos is through bifurcation via periods 2, 3, 4 and 5 from period-1 oscillation. The periodic windows and chaotic regions appear in alternation. The energy loss caused by the domain wall motion was calculated; the value of the energy loss in chaotic motion is larger than that for regular motion, despite their having the same damping coefficient. Chaotic motion is thus a new mechanism causing increases in the energy loss.
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