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 52.54: Poster

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

Magnon dispersion relation in adiabatic spin approximation — •Christian Franz and Christian Heiliger — I. Physikalisches Institut, Justus-Liebig-Universität, Gießen, Deutschland

The adiabatic approximation is used to separate the fast electronic degrees of freedom from the slow magnetic ones. A single magnetic moment is assigned to each atom in an itinerant ferromagnet. The interaction of these moments can be described by an effective Heisenberg model.

The exchange parameters of this model are obtained from ab initio calculations by applying the magnetic force theorem. The magnon dispersion and various physical parameters as the spin-wave stiffness and the Curie temperature can be determined within this model. We perform this calculations several systems and find result in good agreement with experimental and other theoretical results. This is the first step in including magnons and the electron-magnon interaction in transport calculations.