Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
Phys Rev Lett. 2010 Jul 9;105(2):027203. doi: 10.1103/PhysRevLett.105.027203.
We propose a semiclassical model for femtosecond laser-induced demagnetization due to spin-polarized excited electron diffusion in the superdiffusive regime. Our approach treats the finite elapsed time and transport in space between multiple electronic collisions exactly, as well as the presence of several metal films in the sample. Solving the derived transport equation numerically we show that this mechanism accounts for the experimentally observed demagnetization within 200 fs in Ni, without the need to invoke any angular momentum dissipation channel.
我们提出了一种半经典模型，用于解释飞秒激光诱导的退磁化现象，这是由于超扩散区域中自旋极化激发电子的扩散。我们的方法精确地处理了有限的弛豫时间和多次电子碰撞之间的空间输运，以及样品中存在多个金属膜的情况。通过数值求解得到的输运方程，我们表明该机制在没有任何角动量耗散通道的情况下，在 200fs 内解释了 Ni 中实验观测到的退磁化现象。
