Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 36: Magnetic Particles and Clusters II
MA 36.8: Vortrag
Donnerstag, 26. März 2009, 17:00–17:15, HSZ 401
Mapping of ultrafast magnetic-switch scenarios to infrared spectroscopy — •Georgios Lefkidis, Chun Li, and Wolfgang Hübner — Department of Physics and Research Center OPTIMAS, Kaiserslautern University of Technology, Box 3049, 67653 Kaiserslautern, Germany
We present a first-principles controlled ultrafast magnetooptical switch and transfer mechanism in small two-magnetic-center clusters exploiting spin-orbit-coupling enabled Λ-processes [1-4]. By attaching CO to one of the magnetic centers of the [CoMg2Ni]+ and [CoNi]+ clusters and optimizing the structure we detect a mapping of the laser-induced spin manipulation to the IR spectrum of CO. The predicted spin-state-dependent CO frequencies can facilitate experimental monitoring of the processes. The lower electronic states of the clusters exhibit a very high degree of spin localization either at the Co or the Ni site. Spin flip on one magnetic atom and transfer from one magnetic center to the other are realized in structurally optimized magnetic clusters with fidelities that reach 99.8%.
[1] C. Li, G. Lefkidis and W. Hübner, arXiv:0811.4042v1 [cond-mat.other]
[2] R. Gomez-Abal, O. Ney, K. Satitkovitchai and W. Hübner, PRL 92, 227402 (2004)
[3] G. Lefkidis and W. Hübner, PRB 76, 014418 (2007)
[4] T. Hartenstein, C. Li, G. Lefkidis and W. Hübner, JPD 41, 164006 (2008).