Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 20: POSTER Ib

MA 20.30: Poster

Tuesday, March 17, 2015, 09:30–13:00, Poster A

Investigation of spin waves dispersion in Co thin films on W(110) from first-principles — •Flaviano José Dos Santos, Manuel Dos Santos Dias und Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

We perform first-principles calculations based on the Korringa-Kohn-Rostoker Green functions method in order to extract the magnetic exchange interactions for Co thin films on W(110) surface. We analyze the strength and oscillatory behavior of the intra-layer and inter-layer magnetic interactions and investigate the resulting dispersion of spin waves as a function of the thickness of Co films. We compare our results to previous [1] and recent [2] measurements based on electron energy loss spectroscopy. In particular, we demonstrate the strong impact of hybridization of the electronic states at the interface of Co and W on the magnetic exchange interactions and on the spin-waves dispersion curve.

Work supported by the Coordenadoria de Aperfeiçoamento de Pessoal de Nível Superior - CAPES (BRAZIL) and HGF-YIG Programme FunSiLab - Functional Nanoscale Structure Probe and Simulation Laboratory (VH-NG-717). [1] M. Etzkorn, P. S. Anil Kumar, W. Tang, Y. Zhang, and J. Kirschner, Phys. Rev. B 72, 184420 (2005). [2] E. Michel, H. Ibach, and C. M. Schneider, private communication.