论文标题
Heisenberg Exchange和Dzyaloshinskii-Moriya在超薄COFEB中的互动和多层
Heisenberg Exchange and Dzyaloshinskii-Moriya Interaction in Ultrathin CoFeB Single and Multilayers
论文作者
论文摘要
我们介绍了对在超薄的单层和多裂COFEB层上具有相邻重金属层的旋转波的分析（BLS）测量的结果。通过对自旋分散关系的详细研究，我们独立提取了海森贝格交换相互作用（也称为对称交换相互作用），dzyaloshinskii-moriya相互作用（DMI，也称为抗对称交换相互作用）和各型反应场。我们在邻近PT层的COFEB薄膜中发现了一个大的DMI，而与W层相邻的COFEB膜几乎消失了DMI。此外，还展示了偶极相互作用对分散关系和海森堡交换参数评估的残留影响。此外，提出了对自旋波寿命上DMI的实验分析。所有这些参数在设计Skyrmionic或自旋轨道设备方面起着至关重要的作用。
We present results of the analysis of Brillouin Light Scattering (BLS) measurements of spin waves performed on ultrathin single and multirepeat CoFeB layers with adjacent heavy metal layers. From a detailed study of the spin-wave dispersion relation, we independently extract the Heisenberg exchange interaction (also referred to as symmetric exchange interaction), the Dzyaloshinskii-Moriya interaction (DMI, also referred to as antisymmetric exchange interaction), and the anisotropy field. We find a large DMI in CoFeB thin films adjacent to a Pt layer and nearly vanishing DMI for CoFeB films adjacent to a W layer. Furthermore, the residual influence of the dipolar interaction on the dispersion relation and on the evaluation of the Heisenberg exchange parameter is demonstrated. In addition, an experimental analysis of the DMI on the spin-wave lifetime is presented. All these parameters play a crucial role in designing skyrmionic or spin-orbitronic devices.
