在晶体铁磁体中模拟激光诱导的全光自旋开关的尝试

G. P. Zhang, R. Meadows, A. Tamayo, Y. Bai, T. George
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引用次数: 4

摘要

对全光自旋开关(AOS)的兴趣正在迅速增长。最近在Mn$_2$RuGa中发现的AOS为理论模拟提供了急需的晶体铁磁体的干净案例。在这里,我们尝试用最先进的第一性原理方法结合海森堡交换模型来模拟它。我们首先计算两个不相等锰位点的自旋矩,然后将它们输入到我们的模型哈密顿量中。我们使用超快激光脉冲来切换自旋。我们发现有一个相似的最佳激光场振幅来切换自旋。然而,我们发现交换交互对系统的可切换性有显著的影响。削弱交换交互可能使系统不可切换。这为铁磁体的开关机制提供了重要的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An attempt to simulate laser-induced all-optical spin switching in a crystalline ferrimagnet
Interest in all-optical spin switching (AOS) is growing rapidly. The recent discovery of AOS in Mn$_2$RuGa provides a much needed clean case of crystalline ferrimagnets for theoretical simulations. Here, we attempt to simulate it using the state-of-the-art first-principles method combined with the Heisenberg exchange model. We first compute the spin moments at two inequivalent manganese sites and then feed them into our model Hamiltonian. We employ an ultrafast laser pulse to switch the spins. We find that there is a similar optimal laser field amplitude to switch spins. However, we find that the exchange interaction has a significant effect on the system switchability. Weakening the exchange interaction could make the system unswitchable. This provides a crucial insight into the switching mechanism in ferrimagnets.
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