Electric-field control of exchange interactions
Electric-field control of exchange interactions
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DOI：
10.1103/physrevb.104.174443
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发表时间：
2021-08
影响因子：
3.7
通讯作者：
S. Mankovsky;E. Simon;S. Polesya;A. Marmodoro;H. Ebert
中科院分区：
文献类型：
--
作者：
S. Mankovsky;E. Simon;S. Polesya;A. Marmodoro;H. Ebert
基于第一性原理电子结构计算，利用KKR格林函数法研究了外加电场对交换耦合参数的影响。计算是针对一种独立的Fe薄膜进行的，该薄膜沉积在两种不同的衬底上，具有1层（ML）厚度，以最大限度地减少金属系统典型电场屏蔽的影响。通过与不同基质上的铁离子交换的结果进行比较，我们可以分析场诱导交换作用变化的原因。与独立的Fe ML相比，由于Fe/Pt界面的局域电子态受到电场的强烈影响，并在Fe-Fe交换相互作用中起重要作用，Fe/Pt（111）体系发生了特别明显的变化。
The impact of an applied electric field on the exchange coupling parameters has been investigated based on first-principles electronic structure calculations by means of the KKR Green function method. The calculations have been performed for a Fe film, free-standing and deposited on two different substrates, having 1 monolayer (ML) thickness to minimize the effect of screening of the electric field typical for metallic systems. By comparing the results for the free-standing Fe ML with those for Fe on the various substrates, we could analyze the origin of the field-induced change of the exchange interactions. Compared to thefree-standing Fe ML, in particular rather pronounced changes have been found for the Fe/Pt(111) system due to the localized electronic states at the Fe/Pt interface, which are strongly affected by the electric field and which play an important role for the Fe-Fe exchange interactions.