Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 8: Magnetic Particles/ Clusters I

MA 8.6: Vortrag

Montag, 14. März 2011, 16:00–16:15, HSZ 103

Ab initio investigation of the role of the interatomic distances to optical spin manipulation in metallic three-center magnetic clusters — •Hongping Xiang, Georg Lefkidis, and Wolfgang Hübner — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern

Recently, laser-induced femtomagetism opened a new frontier for the faster magnetic logic devices in order to complement conventional elements [1]. The laser-induced spin flip and transfer in magnetic multicenter nanostructures have been investigated widely as an appealing alternative. Previously, we found that in the realistic three-center metallic cluster Ni$_3$Na$_2$ (3.6 Å interatomic distance), laser-induced a spin flip and transfer can be achieved within a hundred femtoseconds [2]. Here, we investigate the effect of the structural distortion of Ni$_3$Na$_2$ on the magnetic state and the speed and fidelity of spin flip and transfer by changing the interatomic distances. If we decrease the interatomic distance in steps of 0.05 Å the spin localization remains the same but the spin density decreases. When the distance reaches 3.4 Å the spin localization changes as well. Similar effects appear if we increase the distance. We further investigate these effects on the speed and the fidelity of the $\Lambda$ processes.

\noindent [1] G. P. Zhang, W. Hübner, G. Lefkidis, Y. Bai, T. F. George, Nat. Phys. {\bf 5}, 499 (2009)

\noindent [2] W. Hübner, Kersten, S., Lefkidis, G., Phys. Rev. B {\bf 79}, 184431 (2009)