Homochiral Magnetic Structures in Deposited Clusters

生物聚合物独特的同手性和电弱相互作用的宇称破坏是两个迷人的例子，其中自然定律对于图像和镜像是不同的。我们相信这也适用于沉积在表面上的金属团簇的磁性结构。我们提出的调查的存在和强度的Dzyaloshinskiii-Moriya（DM）的相互作用，优选的铁磁簇，例如铁，钴，镍，钌，和Os，沉积在基板上具有大的核数，例如W，Ir，Pt，Pb，或Bi。我们认为，在过去20年的从头计算磁性的小磁性物体上沉积在基板上，磁性只解释了对称海森堡交换和磁（单轴）各向异性的基础上，而DM相互作用被忽视，忽略或遗忘。我们将在基于密度泛函理论的相对论Korringa-Kohn-Rostoker绿色函数（KKR-GF）方法中实现一种基于无限小旋转的思想来计算DM相互作用强度的方法，即DM矢量D。我们将证明DM相互作用的强度足以与其他相互作用竞争以产生同手性磁结构。由于DM矢量D决定性地依赖于系统的对称性，因此团簇为此类研究提供了特别富有成效的领域。

The unique homochirality of biopolymers and the parity violation of the electroweak interaction are two fascinating examples where the laws of nature are different for an image and for a mirror image. We believe this is also true for the magnetic structure in metal clusters deposited on surfaces. We propose the investigation of the existence and the strength of the Dzyaloshinskii- Moriya (DM) interaction of preferably ferromagnetic clusters, e.g. Fe, Co, Ni, Ru, and Os, deposited on substrates with large nuclear numbers, e.g. W, Ir, Pt, Pb, or Bi. We argue that during the past 20 years of ab initio calculations on the magnetism of small magnetic objects deposited on substrates, magnetism has only been explained on the basis of the symmetric Heisenberg exchange and the magnetic (uniaxial) anisotropy, while the DM interaction had been either overlooked, ignored or forgotten. We will implement an approach to calculate the strength of DM interaction, the DM-vector D, based on the idea of infinitesimal rotations, in a relativistic Korringa-Kohn-Rostoker Green function (KKR-GF) method based on the density functional theory. We will prove that the strength of the DM interaction is sufficient to compete with the other interactions to produce homochiral magnetic structures. Since the DM vector D depends decisively on the symmetry of the system, clusters provide a particularly fruitful field for such studies.