Interface Electronic Complexes and Landau Damping of Magnons in Ultrathin Magnets
Interface Electronic Complexes and Landau Damping of Magnons in Ultrathin Magnets
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DOI：
10.1103/physrevlett.106.157204
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发表时间：
2011-04-13
影响因子：
8.6
通讯作者：
Sandratskii, Leonid M.
中科院分区：
文献类型：
--
作者：
Buczek, Pawel;Ernst, Arthur;Sandratskii, Leonid M.
从第一性原理出发，研究了双金属磁体中磁振子的阻尼。我们对比了Fe/Cu（100）和Fe/W（110）两种系统，衬底对磁振子寿命的影响有很大的不同。我们在动量空间中引入了朗道映射的概念来评估不同电子态在衰减中的作用。局域在薄膜-衬底界面处的电子复合物的形成导致朗道图中的热点，并增强阻尼。这一发现允许调谐纳米结构中的高频磁化动力学的衰减。
The damping of magnons in ultrathin metallic magnets is studied from first-principles. We contrast Fe/Cu(100) and Fe/W(110) systems for which the influence of the substrate on the magnon life time differs strongly. We introduce the concept of Landau map in momentum space to assess the role of different electronic states in the attenuation. The formation of electronic complexes localized at the film-substrate interface leads to hot spots in the Landau maps and enhances the damping. This finding allows tuning the attenuation of high-frequency magnetization dynamics in nanostructures.