Brovko O O, Ignatiev P A, Stepanyuk V S, Bruno P
Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D06120 Halle, Germany.
Phys Rev Lett. 2008 Jul 18;101(3):036809. doi: 10.1103/PhysRevLett.101.036809.
We present a novel approach to spin manipulation in atomic-scale nanostructures. Our ab initio calculations clearly demonstrate that it is possible to tune magnetic properties of subnanometer structures by adjusting the geometry of the system. By the example of two surface-based systems we demonstrate the following. (i) The magnetic moment of a single adatom coupled to a buried magnetic Co layer can be stabilized in either a ferromagnetic or an antiferromagnetic configuration depending on the spacer thickness. It is found that a buried Co layer has a profound effect on the exchange interaction between two magnetic impurities on the surface. (ii) The exchange interaction between magnetic adatoms can be manipulated by introducing artificial nonmagnetic Cu chains to link them.
我们提出了一种在原子尺度纳米结构中进行自旋操控的新方法。我们的从头算计算清楚地表明，通过调整系统的几何结构，可以调节亚纳米结构的磁性。通过两个基于表面的系统的例子，我们证明了以下几点。(i) 与埋入的磁性钴层耦合的单个吸附原子的磁矩可以根据间隔层厚度稳定在铁磁或反铁磁构型中。发现埋入的钴层对表面上两个磁性杂质之间的交换相互作用有深远影响。(ii) 可以通过引入人工非磁性铜链来连接磁性吸附原子，从而操控它们之间的交换相互作用。
