Yang See-Hun, Parkin Stuart
IBM Research-Almaden, San Jose, CA 95120, United States of America.
J Phys Condens Matter. 2017 Aug 2;29(30):303001. doi: 10.1088/1361-648X/aa752d. Epub 2017 Jun 22.
In this article, we review fascinating new mechanisms on recently observed remarkable current driven domain wall motion in nanowires formed from perpendicularly magnetized synthetic antiferromagnets interfaced with heavy metallic layers, sources of spin-orbit torques. All the associated torques such as volumetric adiabatic and non-adiabatic spin-transfer-torque, spin-orbit torques, shape anisotropy field torques, Dzyaloshinkii-Moriya interaction torques and most importantly a new powerful torque, exchange coupling torque, will be discussed based on an analytical model that provides an intuitive description of domain wall dynamics in synthetic ferromagnets as well as synthetic antiferromagnets. In addition, the current driven DW motion in the presence of in-plane fields will be investigated, thus deepening our knowledge about the role of the exchange coupling torque, which will be of potential use for application to various novel spintronic devices.
在本文中，我们回顾了一些引人入胜的新机制，这些机制与最近观察到的由垂直磁化的合成反铁磁体与重金属层（自旋轨道转矩源）界面形成的纳米线中显著的电流驱动畴壁运动有关。将基于一个分析模型来讨论所有相关的转矩，如体积绝热和非绝热自旋转移转矩、自旋轨道转矩、形状各向异性场转矩、Dzyaloshinkii-Moriya相互作用转矩，以及最重要的一种新的强大转矩——交换耦合转矩。该分析模型对合成铁磁体以及合成反铁磁体中的畴壁动力学提供了直观描述。此外，还将研究面内磁场存在时的电流驱动畴壁运动，从而加深我们对交换耦合转矩作用的认识，这对于应用于各种新型自旋电子器件可能具有潜在用途。
