Multiscale modeling of ultrafast spin dynamics (A08)

我们发展了一个多尺度模型的超快自旋动力学。我们使用原子自旋动力学方法参数化的第一性原理计算模型的亚皮秒自旋动力学的过渡金属，稀土，和它们的双层激发后，飞秒激光脉冲。我们将研究太赫兹辐射在磁性绝缘体钇铁石榴石中诱发的自旋动力学，以及超快自旋电流激发的自旋动力学。我们的建模补充了实验工作，以进一步理解和控制超快自旋动力学和开关。以原子自旋动力学模型的结果为输入参数，用微磁模型研究了磁畴的皮秒动力学。

We develop a multiscale model for ultrafast spin dynamics. We use atomistic spin dynamics methods parameterized from first principles calculations to model sub-picosecond spin dynamics of transition metals, rare-earths, and their bilayers after excitation with femtosecond laser pulses. Spin dynamics induced by THz radiation in the magnetic insulator yttrium iron garnet, and spin dynamics excited by ultrafast spin currents will be investigated. Our modeling complements experimental work to further understand and to control ultrafast spin dynamics and switching. The picosecond dynamics of magnetic domains is investigated by micromagnetic models, using the results of the atomistic spin dynamics model as input parameters.