Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 12: Magnetic Particles/ Clusters II
MA 12.7: Vortrag
Montag, 14. März 2011, 18:30–18:45, HSZ 103
The role of bridge atoms in the ultrafast laser-driven spin-manipulation in charged magnetic two-center nanostructures — •Wolfgang Hübner1, Chun Li2, and Georg Lefkidis1 — 1University of Kaiserslautern and Research Center OPTIMAS, Germany — 2Northwestern Polytechnical University, Xi’an, China
We present an ab initio theory of ultrafast laser-induced magnetic switching in charged magnetic two-center nanostructures via Λ processes [1-2]. To improve the spin transferability between the magnetic centers, and to fulfill the energetic requirements for the Λ process [3], a small number of bridge atoms (O and Mg) is inserted in order to connect the active magnetic centers (Fe, Co, Ni). The nature of these nonmagnetic bridges changes the overlap between the magnetic atoms. It is found that both types of bridges contribute to spin redistribution on magnetic centers, i.e. change the spin density or reverse the localization. Especially, in the spin-transfer scenario on [Fe-O(Mg)-Co]+ the bridges improve the transferability between the magnetic centers due to the tilting or branching of the linear chain. We generally find that lowering the symmetry using bridging atoms facilitates spin transfer, while spin-flip depends basically on the nature of the magnetic center.
[1] C. Li, T. Hartenstein, G. Lefkidis, and W. Hübner, PRB 79, 180413(R) (2009)
[2] C. Li, G. Lefkidis and W. Hübner, J. Phys.: Conf. Ser. 200, 042014 (2010)
[3] G. Lefkidis, G. P. Zhang, and W. Hübner, PRL 103, 217401 (2009).