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MA: Fachverband Magnetismus

MA 30: Spin-Torque Phenomena

MA 30.11: Talk

Wednesday, March 9, 2016, 12:45–13:00, H33

Investigation of spin wave dispersions in Co thin films on W(110) from first-principles — •Flaviano José Dos Santos, Manuel Dos Santos Dias, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52428 Jülich, Germany

We computed spin wave dispersions of a few monolayers of Co deposited on the W(110) surface in the adiabatic approximation. The magnetic exchange interactions are obtained via first-principles electronic structure calculations using the Korringa-Kohn-Rostoker Green function method. 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 recent measurements [1] 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. The distance dependence of the magnetic interactions is found to be strongly anisotropic, which we connect to the presence of quantum well states in the Co films.

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] E. Michel, H. Ibach, and C. M. Schneider, Phys. Rev. B 92, 024407 (2015).