Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden.
Phys Rev Lett. 2011 Jul 15;107(3):037202. doi: 10.1103/PhysRevLett.107.037202. Epub 2011 Jul 11.
We examine the experimental absence of standing spin wave modes in thin magnetic films, by means of atomistic spin dynamics simulations. Using Co on Cu(001) as a model system, we demonstrate that by increasing the number of layers, the optical branches predicted from adiabatic first-principles calculations are strongly suppressed, in agreement with spin-polarized electron energy loss spectroscopy measurements reported in the literature. Our results suggest that a dynamical analysis of the Heisenberg model is sufficient in order to capture the strong damping of the standing modes.
我们通过原子自旋动力学模拟研究了在薄铁磁膜中，自旋波模式的实验缺失。我们以 Co 在 Cu(001)上的吸附为例，证明了通过增加膜的层数，可以强烈抑制绝热第一性原理计算所预言的光学支，这与文献中报道的自旋极化电子能量损失谱测量结果一致。我们的结果表明，为了捕捉到驻波模式的强烈阻尼，对海森堡模型进行动力学分析是足够的。
