Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 36: Magnetic Particles and Clusters II
MA 36.9: Vortrag
Donnerstag, 26. März 2009, 17:15–17:30, HSZ 401
Electronic theory of ultrafast spin dynamics: Towards magnetic nanologic elements — •Wolfgang Hübner1, Sander Kersten1,2, and Georgios Lefkidis1 — 1Dept. of Physics and Research Center OPTIMAS, University of Kaiserslautern, Box 3049, 67653 Kaiserslautern, Germany — 2Dept. of Applied Physics, Eindhoven University of Technology, Box 513, 5600 MB, Eindhoven, The Netherlands
We present a fully ab initio theory of ultrafast nanologic elements and show that controlled spin manipulation is feasible with the inclusion of spin-orbit coupling thus realizing a Λ-process [1-3]. We discuss the requirements of such elements and we devise realistic 3-magnetic-center clusters. Out of a multitude of clusters we show, using high-level quantum chemistry, that in Ni2Na3 both spin flips and spin transfers are possible within a hundred femtoseconds. An external B-field and the state of one magnetic center serve as input bits, while the magnetic state of the cluster after a controlled laser pulse can be mapped to the result of a logic operation induced by the laser pulse. We are able to construct an OR, an XOR (CNOT) and two AND gates [4]. Thus multicenter magnetic clusters form suitable objects for extending spin dynamics to optically triggered and properly functionalized magnetic transport on a subpicosecond timescale and nanometer spatial scale.
[1] R. Gómez-Abal et al., PRL 92, 227402 (2004)
[2] G. Lefkidis and W. Hübner, PRB 76, 014418 (2007)
[3] T. Hartenstein et al., JPD 41, 164006 (2008)
[4] W. Hübner, S. Kersten and G. Lefkidis (unpublished)