Numerical analysis of the Landau-Lifshitz-Gilbert equation with inertial effects

Numerical analysis of the Landau-Lifshitz-Gilbert equation with inertial effects
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具有惯性效应的 Landau-Lifshitz-Gilbert 方程的数值分析

DOI:
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发表时间:
2021
期刊:
arXiv.org
影响因子:
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通讯作者:
M. Ruggeri
M. Ruggeri
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作者:
M. Ruggeri

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我们考虑惯性 Landau-Lifshitz-Gilbert 方程 (iLLG) 的数值近似,该方程描述了亚皮秒时间尺度下铁磁材料磁化的动力学。我们提出并分析了两种完全离散的数值方案:第一种方法基于将问题重新表述为线速度的线性约束变分公式。第二种方法将问题重新表述为磁化强度和角动量的及时一阶系统。两种方案都是隐式的,基于一阶有限元,并生成满足基础网格顶点处 iLLG 单位长度约束的近似值。对于这两种方法,我们证明了近似值对问题弱解的收敛性。数值实验验证了理论结果,表明该方法对于超快磁过程模拟的适用性。
We consider the numerical approximation of the inertial Landau-Lifshitz-Gilbert equation (iLLG), which describes the dynamics of the magnetization in ferromagnetic materials at subpicosecond time scales. We propose and analyze two fully discrete numerical schemes: The first method is based on a reformulation of the problem as a linear constrained variational formulation for the linear velocity. The second method exploits a reformulation of the problem as a first order system in time for the magnetization and the angular momentum. Both schemes are implicit, based on first-order finite elements, and generate approximations satisfying the unit-length constraint of iLLG at the vertices of the underlying mesh. For both methods, we prove convergence of the approximations towards a weak solution of the problem. Numerical experiments validate the theoretical results and show the applicability of the methods for the simulation of ultrafast magnetic processes.
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