Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle/S., Germany.
Phys Rev Lett. 2010 Aug 27;105(9):097205. doi: 10.1103/PhysRevLett.105.097205.
We report on the linear response density functional study of the magnetization dynamics in Co(100) film driven by a nonuniform magnetic field. At resonant frequencies in the terahertz range, the magnetic field excites standing spin waves of the system and the induced magnetization penetrates the whole volume of the film. The pattern of magnetization precession is strongly influenced by the spin-flip excitations of single electrons which lead to the Landau damping of the spin-wave modes. Our results pave the way for the precise control of terahertz magnetization dynamics in itinerant magnets.
我们报告了在非均匀磁场驱动下 Co(100) 薄膜中磁化动力学的线性响应密度泛函研究。在太赫兹范围内的共振频率下，磁场激发了系统的驻波自旋波，诱导磁化穿透了薄膜的整个体积。磁化进动的模式受到单个电子自旋翻转激发的强烈影响，这导致了自旋波模式的朗道阻尼。我们的结果为在巡游磁体中精确控制太赫兹磁化动力学铺平了道路。
