Pt（111）上Mn化合物的共线到涡旋磁结构
From collinear to vortex magnetic structures in Mn corrals on Pt(111)
摘要：
在密度泛函理论的框架下，研究了Pt（111）表面上Mn小团簇的磁性.我们发现Mn原子具有大的磁矩，数量级为4 μ B/原子，并具有主要的反铁磁原子间交换作用。发现在环状团簇中存在量子限域效应，表明即使很小的团簇也可以被看作量子限域。反铁磁交换耦合导致在简单的corpendum的共线磁排列，以及复杂的非共线有序，如涡旋状结构，为corpendum与特定的几何形状的情况下，反铁磁性变得沮丧。
英文摘要：
We study the magnetic properties of small Mn ring shaped clusters on a Pt(111) surface in the framework of density functional theory. We find that the Mn atoms possess large magnetic moments, of the order of 4uB/atom, and have dominating antiferromagnetic interatomic exchange interactions. A quantum confinement effect within the ring like clusters was found, indicating that even very small clusters can be seen as quantum corrals. The antiferromagnetic exchange couplings lead to collinear magnetic arrangements in simple corrals, as well as complex non-collinear ordering, as vortex-like structures, for the case of corrals with particular geometry where antiferromagnetism becomes frustrated.
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