Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport

MA 52.52: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Dynamical magnetic susceptibility of nanostructures with spin–orbit coupling — •Manuel dos Santos Dias, Stefan Blügel, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

We outline a real–space linear response theory of the dynamical spin susceptibility of nanostructures, accounting for the spin–orbit interaction. The starting point is the existing formalism of time–dependent Density Functional Theory, in the Korringa–Kohn–Rostoker Green function method [1,2]. The linear response to an external time-dependent applied magnetic field transverse to the orientation of the magnetisation generates both transverse and longitudinal time-dependent spin susceptibilities, while the induced charge fluctuations introduce the screened Coulomb interaction in the problem. The breaking of the spin rotational invariance due to the spin–orbit interaction is explored, and the roles of the familiar magnetocrystalline anisotropy and the coupled spin–charge fluctuations are compared, and some examples for adatoms on simple non–magnetic surfaces are given.

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)

[2] S. Lounis, A. T. Costa, R. B. Muniz and D. L. Mills, Phys. Rev. B 83, 035109 (2011)