arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.4841cond-mat.mes-hallcond-mat.str-el
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工程表面自旋结构的第一性原理计算

First-principles Calculations of Engineered Surface Spin Structures

Chiung-Yuan Lin, B. A. Jones

摘要:

利用密度泛函理论计算了最近在扫描隧道显微镜实验中建立和测量的工程自旋结构。通过对表面杂质的精确局域结构的测定,我们发现Mn原子可以与结合表面形成分子结构,表现出类似于表面分子磁体的行为。自旋结构被证实是反铁磁的,交换耦合的计算值在8%以内的实验值简单的共线自旋GGA+U计算。我们也可以解释为什么交换耦合显着变化与不同的杂质结合位点从确定的本地结构。通过计算Mn原子吸附前后原子电荷的变化研究了键的极性。

英文摘要:

The engineered spin structures recently built and measured in scanning tunneling microscope experiments are calculated using density functional theory. By determining the precise local structure around the surface impurities, we find the Mn atoms can form molecular structures with the binding surface, behaving like surface molecular magnets. The spin structures are confirmed to be antiferromagnetic, and the exchange couplings are calculated within 8% of the experimental values simply by collinear-spin GGA+U calculations. We can also explain why the exchange couplings significantly change with different impurity binding sites from the determined local structure. The bond polarity is studied by calculating the atomic charges with and without the Mn adatoms.

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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