论文标题
非本地阻尼对铁磁体木元性质的影响
Influence of non-local damping on magnon properties of ferromagnets
论文作者
论文摘要
我们研究了非本地阻尼对Fe，Co，Co，Ni和Fe $ _ {1-X} $ CO $ $ _ {X} $（$ x = 30 \％，50 \％$）合金的木剂属性的影响。在实验和理论建模中，吉尔伯特阻尼参数通常被视为局部标量。然而，最近的工作表明，吉尔伯特阻尼是一种非本地量，可以在原子部位之间进行能量耗散。通过根据最先进的真实空间电子结构方法计算的吉尔伯特阻尼参数，从旋转动力学和线性响应中评估了镁寿命，在这两种方法之间发现了良好的一致性。发现非本地阻尼会根据系统的不同方式影响镁寿命。具体而言，我们发现在Fe，Co和Ni中，非本地阻尼会降低镁寿命，而$ \ rm fe_ {70} co_ {30} $和fe $ _ {50} $ _ {50} $ _ {50} $相反，非局限性阻尼效应是我们的数据，并且以前的数据表明了这一点。
We study the influence of non-local damping on magnon properties of Fe, Co, Ni and Fe$_{1-x}$Co$_{x}$ ($x=30\%,50\%$) alloys. The Gilbert damping parameter is typically considered as a local scalar both in experiment and in theoretical modelling. However, recent works have revealed that Gilbert damping is a non-local quantity that allows for energy dissipation between atomic sites. With the Gilbert damping parameters calculated from a state-of-the-art real-space electronic structure method, magnon lifetimes are evaluated from spin dynamics and linear response, where a good agreement is found between these two methods. It is found that non-local damping affects the magnon lifetimes in different ways depending on the system. Specifically, we find that in Fe, Co, and Ni the non-local damping decreases the magnon lifetimes, while in $\rm Fe_{70}Co_{30}$ and Fe$_{50}$Co$_{50}$ an opposite, non-local damping effect is observed, and our data show that it is much stronger in the former.
