Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 20: Electron Theory of Magnetism

MA 20.3: Talk

Tuesday, March 15, 2011, 11:30–11:45, HSZ 103

Ab-initio calculation of the Gilbert damping parameter for transition metal alloys — •Sergiy Mankovsky, Diemo Ködderitzsch, and Hubert Ebert — Dept. Chemie/Phys. Chemie, Universität München, Butenandtstr. 11, D-81377 München, Deutschland

We present a theoretical approach for the calculation of the Gilbert damping parameter α using the linear response formalism as implemented within the KKR Green’s function technique. The expression for the Gilbert damping parameter was obtained in the adiabatic approximation following the ideas of Brataas et al.[1] This approach was applied to various metal alloy systems. The results for the Gilbert damping parameters are compared with corresponding theoretical results obtained recently by Starikov et al. [2] as well as available experimental data. The theoretical results agree very well among each other demonstrating the equivalence of the two different approaches used. The experimental values for α are reproduced quite well by the calculations concerning the concentration dependence, but are in general larger. This is ascribed to the influence of thermal fluctuations ignored so far in the calculations.

[1] A. Brataas, Y. Tserkovnyak, and G. E. W. Bauer, Phys. Rev. Lett. 101, 037207 (2008).

[2] A. A. Starikov, P. J. Kelly, A. Brataas, Y. Tserkovnyak and G. E. W. Bauer, accepted to Phys. Rev. Lett. (2010)