论文标题
当前引起的旋转和轨道扭矩的隐藏相互作用批量$ _3 $ gete $ _2 $
Hidden interplay of current-induced spin and orbital torques in bulk Fe$_3$GeTe$_2$
论文作者
论文摘要
磁性范德华材料的低晶体对称性自然促进了用于自旋轨道扭矩开关的常见磁性材料中无法发现的自旋轨道复杂性。在这里，使用第一原理方法，我们证明了旋转和轨道自由度的相互作用对Prototype van der waals ferromagnet中的旋转轨道扭矩具有深远的影响：fe $ _3 $ gete $ _2 $（FGT）。虽然我们表明大量FGT托管着其每个层收获的强烈“隐藏”电流诱导的扭矩，但我们发现它们的起源在传统的自旋通量扭矩和所谓的轨道扭矩之间交替，因为磁化方向变化。两种类型的扭矩的行为的急剧差异导致与掺杂的开关性能的非平凡演化。我们的发现促进了非平衡轨道特性的设计，作为在分层的范德华材料中制定自旋轨道扭矩特性的指导机制。
Low crystal symmetry of magnetic van der Waals materials naturally promotes spin-orbital complexity unachievable in common magnetic materials used for spin-orbit torque switching. Here, using first-principles methods, we demonstrate that an interplay of spin and orbital degrees of freedom has a profound impact on spin-orbit torques in a prototype van der Waals ferromagnet: Fe$_3$GeTe$_2$ (FGT). While we show that bulk FGT hosts strong "hidden" current-induced torques harvested by each of its layers, we uncover that their origin alternates between the conventional spin flux torque and the so-called orbital torque as the magnetization direction is varied. A drastic difference in the behavior of the two types of torques results in a non-trivial evolution of switching properties with doping. Our findings promote the design of non-equilibrium orbital properties as the guiding mechanism for crafting the properties of spin-orbit torques in layered van der Waals materials.
