Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 51: Surface and Interface Magnetism I (O jointly with MA)

O 51.3: Talk

Wednesday, April 2, 2014, 11:00–11:15, WIL C107

Spin-orbit coupling and spin dynamics of magnetic adatoms — •Manuel dos Santos Dias and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

The control and manipulation of magnetic nanostructures hinges on understanding of their spin dynamics, which have been phenomenologically described for many systems using the Landau-Lifshitz-Gilbert equation (LLGe). Here we investigate the validity and possible extension of this equation down to the single atom limit. The magnetic excitation spectrum is derived from the dynamical magnetic susceptibility of the electronic system, employing Time–Dependent Density Functional Theory, as implemented in the Korringa–Kohn–Rostoker Green function method [1]. We include spin-orbit and Zeeman couplings in our calculations, and explore the key parameters in the LLGe, the precessional frequency and damping, for 3d adatoms deposited on the Cu(111) and Pt(111) surfaces. See [2] for an example of a theoretical and experimental investigation of Fe adatoms on Pt(111).
Work supported by the HGF-YIG Programme FunSiLab – Functional Nanoscale Structure Probe and Simulation Laboratory (VH-NG-717).
[1] S. Lounis, A. T. Costa, R. B. Muniz and D. L. Mills, Phys. Rev. Lett. 105, 187205 (2010), Phys. Rev. B 83, 035109 (2011)
[2] A. A. Khajetoorians, et al., Phys. Rev. Lett. 111, 157204 (2013)