Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.29: Poster

Tuesday, March 13, 2018, 09:30–13:00, Poster A

Stokes- /Anti-Stokes signal dependance on polarization in BLS measurements on thin magnetic films — •Tobias Jost, David Breitbach, Thomas Meyer, Moritz Geilen, Burkard Hillebrands, and Philipp Pirro — FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Germany

To investigate magnetoelastic phenomena in thin films, Brillouin light scattering can be used to detect excitations of both the lattice (phonons) and the magnetization (magnons). Depending on the selected plane of polarization of the backscattered light, the signal contains either strong contributions of the phonon- or magnon-signal, respectively or a mixture of both. For a clear distinction of these two signal sources in the analysis of experimental data, one has to know the behavior of either of them separately.
In this work, the Stokes- and Anti-Stokes signals in dependence of the plane of polarization were investigated on a thin permalloy film, in which spin waves were excited by a coplanar wave guide. Contrary to expectations the magnon-signal did not drop to zero for any plane of polarization which indicates that the backscattered photons are not completely linear polarized. In addition the Stokes- and Anti-stokes amplitudes did not reach their respective maximum and minimum at the same polarization configuration.