Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.62: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Progress in wavevector-resolved Brillouin light scattering spectroscopy of magnon gases and condensates — •Pascal Frey1, Dmytro A. Bozhko1,2, Vitaliy I. Vasyuchka1, Alexander A. Serga1, and Burkard Hillebrands1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Germany
Brillouin light scattering spectroscopy is a powerful technique for studying dynamic properties of magnetic materials and devices with both frequency and wavevector resolution. Here, we report on an improvement of this technique in a backward scattering geometry. Previously, we presented a method to detect magnons with wavevectors collinear to the applied magnetic field by turning the entire setup, including the magnet system. Here, instead of rotating the magnet itself, we realized a method where we rotate a probing beam around a sample. The method allows for probing of arbitrary magnetized samples in a wide range of magnetic fields with improved resolution. For further refinement, we place a dielectric mirror beneath the sample to enhance the signal from the backward scattering process. To minimize optical aberrations, we strive for deposition of a dielectric mirror directly on the sample. In combination with a new generation of multipass tandem Fabry-Pérot interferometry, the reported wavevector-resolved technique promises significant improvement in the determination of magnon states in energy and phase space. The work is supported by the European Research Council within the ERC Advanced Grant "Supercurrents of Magnon Condensates for Advanced Magnonics".