Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Spincaloric Transport I (jointly with TT)

MA 23.5: Vortrag

Mittwoch, 18. März 2015, 10:30–10:45, H 0110

Coherent spin wave scattering at defects and localization phenomena — •Martin Evers and Ulrich Nowak — University of Konstanz, 78457 Konstanz, Germany

From studies of transport of particles and waves it is known that there are different transport regimes. Under ideal conditions, like in vacuum or in a perfect crystal, transport will be ballistic. However, in reality one has usually to deal with some kind of imperfections that induce disorder in the system. If this disorder is strong enough the transport will become diffusive. As Anderson showed back in 1958 in case of phase coherent scattering disorder can also lead to completely suppressed transport, known as Anderson Localization [1]. For the case of spin waves this could lead to a vanishing magnon propagation length, even without any damping mechanism.

In the framework of a classical spin model the effect of disorder on magnonic transport is studied utilizing the Landau-Lifshitz-Gilbert equation. Numerical investigations of one and two dimensional systems give insight to scattering properties of the systems, e. g. the mean free scattering time. We show directly the existence of Anderson localization in 1D and weak localization, which is a precursor for strong localization, in 2D, showing the ubiquitousness of Anderson Localization in wave physics.

[1] P. W. Anderson, Phys. Rev. 109, 1492 (1958)