Investigation of giant spin-orbit torque in artificial superlattice without inversion symmetry

在本研究中，我们研究了电流在反转非对称超晶格结构中感应的有效磁场，称为自旋轨道力矩（SOT）。沉积并重复Pt、Co和W的几个原子层以形成反转非对称超晶格。在这种结构中，大的SOT被发现在特定的钨厚度和相关的晶体和电子结构。这意味着这种非中心对称的超晶格结构可以通过使用电子结构来设计。这种具有大SOT的非中心对称超晶格可以作为未来低功率密度的磁存储器件。

In this research, we investigated the current induced effective magnetic field, called spin-orbit torque (SOT) from inversion asymmetric superlattice structure. A few atomic layers of Pt, Co, and W are deposited and repeated to form inversion asymmetric superlattice. In this structure, large SOT is found at specific tungsten thickness and correlated with crystal and electronic structure. This implies this non-centrosymmetric superlattice structure can be designed by using the electronic structure. This non-centrosymmetirc superlattice possessing large SOT could be utilized as a future magnetic memory device for low power density.