Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 27: Spindynamik II

MA 27.3: Vortrag

Dienstag, 8. März 2005, 15:45–16:00, TU H1012

Damping of ultrafast spin dynamics in nanostructures: An ab-initio study — •Daniel Steiauf and Manfred Fähnle — Max-Planck-Institut für Metallforschung, Heisenbergstraße 3, 70569 Stuttgart, Germany

Based on the model of Kamberský [1] we calculated the matrix α(M) entering the damping term M×(α(M)· dM/dt) in a generalized Landau-Lifshitz-Gilbert equation by the ab-initio electron theory for bulk materials, atomic monolayers and monatomic wires of Fe, Co and Ni. It turns out that in the monolayers and monatomic wires the damping depends extremely sensitively on the momentary orientation of the magnetization and even vanishes for various orientations. We underpin these surprising numerical results by group-theoretical considerations. This discovery represents an additional option for the optimization of the switching behaviour of nanostructured magnets by choosing a trajectory of the magnetization vector which exhibits the desired properties of the damping.

[1] V. Kamberský, Canadian J. Phys. 48, 2906 (1970).