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MA: Fachverband Magnetismus
MA 31: Focus Session: Magnetic Damping Phenomena in Thin Films and Nanostructures
(jointly with DS)
MA 31.4: Topical Talk
Mittwoch, 13. März 2013, 16:30–17:00, H10
Gilbert damping parameter from first-principles — •Diemo Ködderitzsch1, Sergiy Mankovsky1, Hubert Ebert1, and Georg Woltersdorf2 — 1Universität München, Dept. Chemie, Butenandtstraße 5-13, D-81377 München, Germany — 2Universität Regensburg, Fak. f. Physik, Universitätsstraße 31, 93040 Regensburg, Germany
Conventionally, magnetisation dynamics is discussed on the basis of the Landau-Lifshitz-Gilbert equation containing a damping term for the magnetisation. So far in first-principles calculations, the scattering processes responsible for the transfer of energy associated with the magnetisation to the lattice (due to spin-orbit coupling) are usually represented by an adjustable relaxation time parameter. Recent approaches tackled this problem by introducing a scheme employing scattering theory. [1,2] We here present a general approach to calculate the damping parameter from first-principles based on the linear response Kubo formalism, as implemented within the fully relativistic Korringa-Kohn-Rostoker band structure method. This approach allows, in particular, to account for scattering processes due to chemical disorder or thermal lattice vibrations. Results for 3d transition-metals and their alloys, and impurity systems, compared to experiment demonstrate the viability of the approach. [3,4]
[1] Brataas et al., PRL 101, 037207 (2008) [2] Starikov et al., PRL 105, 236601 (2010) [3] Ebert, Mankowsky, Ködderitzsch and Kelly, PRL 107, 066603 (2011) [4] Mankowsky, Ködderitzsch, Woltersdorf and Ebert, submitted to PRB (2012)