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arXiv 2202.04525cond-mat.mtrl-sci
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磁性薄膜中磁振子的电场控制:二维金属异质结构的从头算预测

Electric field control of magnons in magnetic thin films: ab initio predictions for 2D metallic heterostructures

Alberto Marmodoro, Sergiy Mankovsky, Hubert Ebert, Jan Minár, Ondřej Šipr

摘要:

我们探讨了在二维异质结构中,外加电场作用于电介质势垒,对磁振子进行控制的可能性。通过对真空中悬浮的Fe单层和沉积在Cu(001)上的Fe双层进行从头计算,我们证明了外加电场可以显著地改变磁振子寿命,并且这些变化与场诱导的层分辨Bloch谱函数的变化有关.对于具有更多磁振子色散分支的系统,高能和低能本征模之间的间隙随外场而变化。这些效应受到衬底的强烈影响。可以预期,磁振子谱对外部电场的敏感性会有相当大的变化,这取决于衬底和磁性层的厚度。

英文摘要:

We explore possibilities for control of magnons in two-dimensional heterostructures by an external electric field acting across a dielectric barrier. By performing ab-initio calculations for a Fe monolayer and a Fe bilayer, both suspended in vacuum and deposited on Cu(001), we demonstrate that external electric field can significantly modify magnon lifetimes and that these changes can be related to field-induced changes in the layer-resolved Bloch spectral functions. For systems with more magnon dispersion branches, the gap between high- and low-energy eigenmodes varies with the external field. These effects are strongly influenced by the substrate. Considerable variability in how the magnon spectra are sensitive to the external electric field can be expected, depending on the substrate and on the thickness of the magnetic layer.

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。

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