Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Magnetic Nanostructures

O 5.2: Vortrag

Montag, 25. Februar 2008, 11:30–11:45, MA 043

Tailoring exchange interactions between magnetic adatoms in engeneered nanostructures: ab initio study — •Pavel A. Ignatiev, Valeri S. Stepanyuk, and Patrick Bruno — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

The controllable modification of quantum states in 1D nanostructures could permit one to manipulate their electronic and magnetic properties. An advanced experimental methods, such as the scanning tunneling microscope (STM), allows one to construct chains on surfaces in atom-by-atom fashion [1,2]. Our ab initio calculations unambiguously demonstrate that both sign and magnitude of the exchange interaction between magnetic impurities incorporated in nonmagnetic chains on metal surfaces can be tailored by an appropriate design of the chain length and composition [3]. Such engineered 1D systems are experimentally feasible [4], and the above effects should be detectable with modern technology, for instance, by probing the Kondo resonance [5].

[1] S. Folsch, P. Hyldgaard, R. Koch, and K. H. Ploog Phys. Rev. Lett. 92, 056803 (2004).

[2] N. Nilius T. M. Wallis, and W. Ho, Science 297, 1853 (2002).

[3] P. A. Ignatiev, V. S. Stepanyuk and P. Bruno, submitted to PRL

[4] J. Lagoute, C. Nacci, and S. Folsch Phys. Rev. Lett. 98, 146804 (2007).

[5] P. Wahl, P. Simon, L. Diekhoner, V. S. Stepanyuk, P. Bruno, M. A. Schneider, and K. Kern, Phys. Rev. Lett. 98, 056601 (2007).