论文标题
试图在结晶的铁磁铁中模拟激光引起的全光旋转开关
An attempt to simulate laser-induced all-optical spin switching in a crystalline ferrimagnet
论文作者
论文摘要
对全光自旋开关（AOS）的兴趣正在迅速增长。 MN $ _2 $ ruga中最近发现的AOS提供了一种急需的清洁晶体型铁imag，用于理论模拟。在这里，我们尝试使用最先进的第一原理方法与海森伯格交换模型进行模拟。我们首先在两个不等的锰位点计算旋转力矩，然后将它们送入我们的模型哈密顿量。我们采用超快激光脉冲切换旋转。我们发现有类似的最佳激光场振幅可以开关旋转。但是，我们发现交换交互对系统的切换性有重大影响。削弱交换互动可能会使系统无法交换。这为铁磁体中的开关机理提供了至关重要的见解。
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.
