论文标题
过渡金属二北元素化金/铁磁化双层中的非常规的自旋轨道扭矩来自第一原理计算
Unconventional spin-orbit torque in transition metal dichalcogenide/ferromagnet bilayers from first-principles calculations
论文作者
论文摘要
通过最近观察到\ ch {wte2}/Permalloy双层系统中非常规非平面抑制型转矩的动机，我们计算了使用第一二维金属二甲基（TMD） - ferromagnet杂质构造的二维过渡金属二甲基元素（TMD）中的旋转轨道扭矩。我们对\ ch {wte2}/co和\ ch {mote2}/co异质结构中自旋轨道扭矩的数值计算同时显示了常规和新颖的抑制类托尔尔托（每次电场），具有相当的幅度，约为$ 100〜 \ hbar/hbar/hbar/2e〜（\ hbar/2e〜（\ hbar/fielt）垂直于TMD层的镜面。为了进一步了解阻尼样扭矩的来源，我们计算了TMD和CO层之间的自旋电流通量，并在两个数量之间找到良好的一致性。这表明阻尼状的旋转轨道扭矩的常规图片，从而从旋转厅效应加自旋传输扭矩的扭矩很大程度上适用于TMD/CO BiLayer系统。
Motivated by recent observations of unconventional out-of-plane dampinglike torque in \ch{WTe2}/Permalloy bilayer systems, we calculate the spin-orbit torque generated in two-dimensional transition metal dichalcogenide (TMD)-ferromagnet heterostructures using first-principles methods and linear response theory. Our numerical calculation of spin-orbit torques in \ch{WTe2}/Co and \ch{MoTe2}/Co heterostructures shows both conventional and novel dampinglike torkances (torque per electric field) with comparable magnitude, around $100~\hbar/2e~(\rm Ω\cdot cm)^{-1}$, for an electric field applied perpendicular to the mirror plane of the TMD layer. To gain further insight into the source of dampinglike torque, we compute the spin current flux between the TMD and Co layers and find good agreement between the two quantities. This indicates that the conventional picture of dampinglike spin-orbit torque, whereby the torque results from the spin Hall effect plus spin transfer torque, largely applies to TMD/Co bilayer systems.
