Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Magnetic Clusters

MA 2.2: Vortrag

Montag, 31. März 2014, 09:45–10:00, HSZ 401

Laser control of ultrafast spin dynamics on homonuclear two- and three-magnetic-center clusters — •Wei Jin¹, Chun Li², Georgios Lefkidis¹, and Wolfgang Hübner¹ — ¹Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Box 3049, 67653 Kaiserslautern, Germany — ²School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710072, China

We present a fully ab initio theory for coherent laser-induced ultrafast spin manipulation on homonuclear two- and three-magnetic-center clusters.

For the homodinuclear magnetic clusters (FeOFe, FeOOFe, NiONi and NiOONi) with strong spin localizations induced by the bridging atoms, various spin flip and transfer scenarios are achieved. Out of the four clusters, the Fe-containing ones are more promising for logic operations, and this is consistent with the findings in Ref.[1].

In the pursuit of additional functionality motivated by Ref. [2] about the Co dimer, for the extended cluster Co₃⁺CO we achieve a counterclockwise cycle of spin transfer driven by three sequential laser pulses. The whole process completes within 1.2 ps, which is much faster than any conventional device. Based on this striking functionality a cyclic SHIFT register is proposed as a future application. In the strive for better magnetization dynamics control, the results on these prototypic systems strongly indicate their great potential in spintronic devices.

[1] C. Li et al., Phys. Rev. B 84, 054415 (2011).

[2] C. Li et al., J. Magn. Magn. Mater. 324, 4024 (2012)