Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Spin-Dynamics / Spin-Torque IV

MA 35.9: Vortrag

Donnerstag, 26. März 2009, 17:30–17:45, HSZ 04

Anisotropic and nonlocal damping in near-adiabatic magnetization dynamics — •Jonas Seib, Daniel Steiauf, and Manfred Fähnle — Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart

Recently, a Gilbert type equation of motion was derived by the combination of the phenomenological breathing Fermi surface model and the ab-initio density functional electron theory [1]. This equation is valid on the near-adiabatic time scale. The Gilbert damping scalar is replaced by an anisotropic damping matrix for the case of collinear magnetization. In the case of noncollinear systems, nonlocal damping matrices lead to a nonlocal equation of motion on the atomic length scale.

We show, from the viewpoint of theory, to what extent a FMR (ferromagnetic resonance) experiment can give insight to anisotropic damping parameters in collinear systems. Additionally, we present results for damping parameters in noncollinear systems, which lead to a much stronger damping than in the collinear case.

[1] D. Steiauf, J. Seib, and M. Fähnle, Phys. Rev. B 78, 020410(R) (2008).