共振调制大自旋系统中的滞后、瞬态振荡和非滞后开关
Hysteresis, transient oscillations, and nonhysteretic switching in resonantly modulated large-spin systems
摘要：
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。它导致特征非线性效应。它们包括磁化分支之间的突然切换与变化的调制场没有滞后和特定的模式切换中存在的多稳态和滞后。与稳态受迫振动一起，横向自旋分量可以显示在拉莫尔频率和由各向异性能确定的较慢频率的组合下的瞬态振动。该分析基于微观理论，该理论考虑了对单分子磁体和其他大自旋系统重要的弛豫机制。我们发现如何Landau-Lifshitz模型应该被修改，以描述经典的自旋动力学。瞬态振荡的发生取决于弛豫参数之间的相互关系。
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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