Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)

MA 19.42: Poster

Dienstag, 15. März 2011, 10:45–13:00, P2

T-matrix approach for electron-magnon interactions in ferromagnetic materials — •Mathias C. Müller, Christoph Friedrich, Ersoy Sasioglu, and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

First-principles calculations of the quasiparticle energies and lifetimes in real materials have been performed mainly within the GW approximation (GWA). The GWA has been shown to yield accurate quasiparticle band structures for weakly to moderately correlated systems, whereas it is expected to fail in describing short-range interactions in strongly correlated systems. The scattering between electrons and magnons that takes place in systems with localized d and f orbitals plays an important role in transport and thermodynamic properties of magnetic materials. These scattering phenomena are not accounted for in the GWA. In order to improve the theoretical description of magnetic materials we go beyond the GWA and take higher-order terms into account. We present a formalism that combines the electron-electron scattering described by GWA and the electron-magnon scattering in a unified way. The magnons are calculated with the T-matrix, which describes multiple scattering of electron-hole pairs with different spin. Our implementation is based on the all-electron full-potential linearized augmented-plane-wave (FLAPW) method [1]. As a first step, we calculate the magnon spectra of elementary ferromagnets.
E. Şaşioğlu, A. Schindlmayr, Ch. Friedrich, F. Freimuth, and S. Blügel, Phys. Rev. B 81, 054434 (2010).