Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Magnonics
MA 8.10: Vortrag
Montag, 1. April 2019, 17:30–17:45, H52
Spin waves in disordered film and bulk samples — Pawel Buczek1, •Martin Hoffmann2, Wulf Wulfhekel3, Khalil Zakeri4, and Arthur Ernst2,5 — 1Fakultät Technik und Informatik, Hochschule für Angewandte Wissenschaften Hamburg, Germany — 2Institute for Theoretical Physics, Johannes Kepler University Linz, Austria — 3Physikalisches Institut, Karlsruhe Institute of Technology, Germany — 4Heisenberg Spin-dynamics Group, Physikalisches Institut, Karlsruhe Institute of Technology, Germany — 5Max Planck Institute of Microstructure Physics, Halle, Germany
In many studied materials and mixed compounds, the magnetic response and in particular the energy spectrum of magnons will be strongly influenced by different kinds of disorder. Thin films might consist of islands or alloys might form solid solutions. Hence, we need to take into account disorder as well, in order to describe magnons theoretically. We will present briefly the underlying theory of our two complementary approaches based on a Heisenberg model. The included effective interaction between magnetic moments entering the Heisenberg model can be obtained from first-principles using a self-consistent Green function method within the density functional theory. We demonstrate the application of both methods on experimentally relevant material systems: 3ML Co/Cu(001), 1ML Fe/Pd(001), and Fe-Co alloys. Taking into account the disorder improves a lot the agreement between the spin-polarized electron energy loss spectroscopy measurements and the theoretical results.