论文标题
桥接原子旋转动力学方法和单脉冲超快切换的现象学模型
Bridging atomistic spin dynamics methods and phenomenological models of single pulse ultrafast switching in ferrimagnets
论文作者
论文摘要
我们弥合了对Ferrimagnets全光超快速切换的理解的基本知识差距；也就是说，原子旋转动力学方法与宏观现象学模型之间的联系。将单个飞秒激光脉冲应用于特定的铁磁化合物后，磁化的全光切换发生。这种强烈的激发使所涉及的自由度，电子，晶格和旋转之间彼此之间的平衡不平衡。原子自旋模型已在广泛的实验条件下进行了定量描述的全光开关，同时未能提供切换过程的简单图片。现象学模型能够定性地描述开关过程的动力学。然而，缺少一个统一的理论框架，它描述了特定于元素的自旋动力学是具有现象学简单性的原子旋转模型。在这里，我们弥合了这一差距，并提出了特定于元素的宏观动力学模型，该模型完全与现象学模型的原子旋转动力学模拟和对称性考虑。
We bridge an essential knowledge gap on the understanding of all-optical ultrafast switching in ferrimagnets; namely, the connection between atomistic spin dynamics methods and macroscopic phenomenological models. All-optical switching of the magnetization occurs after the application of a single femtosecond laser pulse to specific ferrimagnetic compounds. This strong excitation puts the involved degrees of freedom, electrons, lattice and spins out-of-equilibrium between each other. Atomistic spin models have quantitatively described all-optical switching in a wide range of experimental conditions, while having failed to provide a simple picture of the switching process. Phenomenological models are able to qualitatively describe the dynamics of the switching process. However, a unified theoretical framework is missing that describes the element-specific spin dynamics as atomistic spin models with the simplicity of phenomenology. Here, we bridge this gap and present an element-specific macrospin dynamical model which fully agrees with atomistic spin dynamics simulations and symmetry considerations of the phenomenological models.
