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arXiv 1505.07367cond-mat.mtrl-sci
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原子模型中的Landau-Lifshitz方程

The Landau-Lifshitz equation in atomistic models

M. O. A. Ellis, R. F. L. Evans, T. A. Ostler, J. Barker, U. Atxitia, O. Chubykalo-Fesenko, R. W. Chantrell

摘要:

Landau-Lifshitz(LL)方程最初是在宏观自旋水平上提出的,现在越来越多地用于原子自旋动力学(ASD)模型。该模型基于具有固定长度的原子自旋的自旋哈密顿量,并使用海森堡形式主义引入交换。ASD模型被证明是一种强大的方法,从根本上理解超快磁化动力学,包括预测热致磁化切换现象,其中磁化反转使用超快激光脉冲在没有外部施加的字段。本文概述了ASD模型的方法,并认为LL方程在这方面的作用和局限性。

英文摘要:

The Landau-Lifshitz (LL) equation, originally proposed at the macrospin level, is increasingly used in Atomistic Spin Dynamic (ASD) models. The models are based on a spin Hamiltonian featuring atomic spins of fixed length, with the exchange introduced using the Heisenberg formalism. ASD models are proving a powerful approach to the fundamental understanding of ultrafast magnetisation dynamics, including the prediction of the thermally induced magnetisation switching phenomenon in which the magnetisation is reversed using an ultrafast laser pulse in the absence of an externally applied field. The paper outlines the ASD model approach and considers the role and limitations of the LL equation in this context.

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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