Tailoring exchange interactions in engineered nanostructures: Ab initio study

Details Tailoring exchange interactions in engineered nanostructures: Ab initio study Tailoring exchange interactions in engineered nanostructures: Ab initio study

2008-04-21

arxiv.org/abs/0804.3298v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, submitted to PRL

Scientific paper

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 sub-nanometer structures by adjusting the geometry of the system. By the example of two surface-based systems we demonstrate that (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.

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