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arXiv 1409.2340math.AP
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一维Landau-Lifshitz-Gilbert方程的自相似解

Self-similar solutions of the one-dimensional Landau-Lifshitz-Gilbert equation

Susana Gutiérrez, André de Laire

摘要:

我们考虑一维Landau-Lifshitz-Gilbert(LLG)方程,一个描述铁磁材料自旋动力学的模型。我们的主要目的是分析研究该模型的双参数族自相似解。在阻尼的存在下,我们的结构提供了一个家庭的整体解决方案的LLG方程是与一个不连续的初始数据的无限(总)能量,这是光滑的,并有有限的能量为所有的积极的时间。特别强调将给予这一家庭的解决方案相对于吉尔伯特阻尼参数的行为。我们想强调的是,我们的分析还包括薛定谔映射的自相似解的研究和作为特殊情况的调和映射到2-球的热流。特别是,这里给出的结果恢复了一些以前已知的结果,在设置的1d-Schrödinger映射方程。

英文摘要:

We consider the one-dimensional Landau-Lifshitz-Gilbert (LLG) equation, a model describing the dynamics for the spin in ferromagnetic materials. Our main aim is the analytical study of the bi-parametric family of self-similar solutions of this model. In the presence of damping, our construction provides a family of global solutions of the LLG equation which are associated to a discontinuous initial data of infinite (total) energy, and which are smooth and have finite energy for all positive times. Special emphasis will be given to the behaviour of this family of solutions with respect to the Gilbert damping parameter. We would like to emphasize that our analysis also includes the study of self-similar solutions of the Schrödinger map and the heat flow for harmonic maps into the 2-sphere as special cases. In particular, the results presented here recover some of the previously known results in the setting of the 1d-Schrödinger map equation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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