Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 54: Spin Excitations I

MA 54.5: Vortrag

Donnerstag, 17. März 2011, 16:00–16:15, HSZ 04

Interface electron complexes and Landau spin-wave damping in ultrathin magnets — Pawel Buczek, Arthur Ernst, and •Leonid Sandratskii — Max Plank Institute of Microstructure Physics, Halle, Germany

The Landau damping of spin-waves in ultrathin magnets caused by the presence of non-magnetic metallic substrate is studied by means of ab initio linear response time dependent density functional theory. By contrasting two systems: 1ML Fe/Cu(100) and 1ML Fe/W(110), we show how the strength and the details of the hybridization of electronic states of the magnetic monolayer and the substrate influence the Landau damping, allowing to tune the latter from moderate to strong. We introduce the concept of Landau map to distinguish the contributions of different groups of electronic states to the spin-wave attenuation. We demonstrate that the contribution coming from the continuum of substrate states is rather weak and uniformly distributed on the Landau map. We explore a novel mechanism leading to a strongly enhanced Landau attenuation in thin magnets. This mechanism is related to the formation of electronic complexes localized at the film-substrate interface and leads to Landau hot spots in the Landau maps. It is demonstrated that the life-time of the magnons in ultrathin films can be longer than in the bulk phases. This paves the way to the design of metallic nanostructures with desired strength of the damping of high frequency magnetization dynamics by means of the engineering of substrate properties.