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摘要翻译：
我们研究了强磁场中共振调制大自旋系统的经典动力学。我们证明了这些系统具有特殊的对称性。它导致了特征非线性效应。它们包括具有不同调制场的磁化支路之间的突变切换和存在多稳性和磁滞时的特定切换模式。在稳定的强迫振动的同时，横向自旋分量可以在拉莫尔频率和由各向异性能决定的较慢频率的组合上显示瞬态振动。该分析基于微观理论，考虑了弛豫机制对单分子磁体和其他大自旋系统的重要作用。我们发现如何改进Landau-Lifshitz模型来描述经典的自旋动力学。瞬态振荡的发生依赖于弛豫参数之间的相互关系。
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英文标题：
《Hysteresis, transient oscillations, and nonhysteretic switching in
resonantly modulated large-spin systems》
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作者：
C. Hicke and M. I. Dykman
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最新提交年份：
2008
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分类信息：
一级分类：Physics 物理学
二级分类：Mesoscale and Nanoscale Physics 介观和纳米物理
分类描述：Semiconducting nanostructures: quantum dots, wires, and wells. Single electronics, spintronics, 2d electron gases, quantum Hall effect, nanotubes, graphene, plasmonic nanostructures
半导体纳米结构：量子点、线和阱。单电子学，自旋电子学，二维电子气，量子霍尔效应，纳米管，石墨烯，等离子纳米结构
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一级分类：Physics 物理学
二级分类：Statistical Mechanics 统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
We study the classical dynamics of resonantly modulated large-spin systems in a strong magnetic field. We show that these systems have special symmetry. It leads to characteristic nonlinear effects. They include abrupt switching between magnetization branches with varying modulating field without hysteresis and a specific pattern of switching in the presence of multistability and hysteresis. Along with steady forced vibrations the transverse spin components can display transient vibrations at a combination of the Larmor frequency and a slower frequency determined by the anisotropy energy. The analysis is based on a microscopic theory that takes into account relaxation mechanisms important for single-molecule magnets and other large-spin systems. We find how the Landau-Lifshitz model should be modified in order to describe the classical spin dynamics. The occurrence of transient oscillations depends on the interrelation between the relaxation parameters.
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PDF链接：
https://arxiv.org/pdf/802.2304
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