arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.08082cond-mat.mes-hall
收藏

动态畴壁自旋波发射的集体坐标研究

Collective coordinate study of spin wave emission from dynamic domain wall

Gen Tatara, Rubén M. Otxoa de Zuazola

摘要:

本文从理论上研究了铁磁体中运动畴壁的自旋波辐射。在集体坐标描述中引入一个描述壁厚调制的变形模式,我们发现壁厚变化与自旋波线性耦合,并诱导自旋波发射.主要发射的自旋波在壁面外($ϕ$)方向上被极化。发射对吉尔伯特阻尼参数的贡献与$\hbarω_ϕ/K$、$ϕ$的角频率$ω_ϕ$和易轴各向异性能$K$的比率成比例。

英文摘要:

We study theoretically the spin wave emission from a moving domain wall in a ferromagnet. Introducing a deformation mode describing a modulation of the wall thickness in the collective coordinate description, we show that thickness variation couples to the spin wave linearly and induces spin wave emission. The dominant emitted spin wave turns out to be polarized in the out-of wall plane ($ϕ$)-direction. The emission contributes to the Gilbert damping parameter proportional to $\hbarω_ϕ/K$, the ratio of the angular frequency $ω_ϕ$ of $ϕ$ and the easy-axis anisotropy energy $K$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑