论文标题
镁对自旋轨道扭矩的温度依赖性和各向异性的影响
Effect of magnons on the temperature dependence and anisotropy of spin-orbit torque
论文作者
论文摘要
我们研究了镁对温度依赖性和自旋轨道扭矩（SOT）的各向异性的影响。为此，我们在Keldysh形式主义的框架中使用第三阶扰动理论，以得出合适的方程式以计算Magnonic SOT。我们发现对宏伟的SOT有一些贡献，这些贡献取决于旋转波刚度$ \ MATHCAL {a} $和温度$ t $，其主导贡献比例像$ t^{2}/\ Mathcal {a} a}^{2} $。基于这种形式主义，我们计算了铁磁性Rashba模型中的Magnonic SOT。对于大rashba参数，宏伟的SOT是各向异性的，对于小型准粒子而言，它可能比非杂种SOT大。
We investigate the influence of magnons on the temperature-dependence and the anisotropy of the spin-orbit torque (SOT). For this purpose we use 3rd order perturbation theory in the framework of the Keldysh formalism in order to derive suitable equations to compute the magnonic SOT. We find several contributions to the magnonic SOT, which depend differently on the spin-wave stiffness $\mathcal{A}$ and on the temperature $T$, with the dominating contribution scaling like $T^{2}/\mathcal{A}^{2}$. Based on this formalism we compute the magnonic SOT in the ferromagnetic Rashba model. For large Rashba parameters the magnonic SOT is strongly anisotropic and for small quasiparticle broadening it may become larger than the non-magnonic SOT.
