Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: PhD Symposium: Magnon Plasmonics (with jDPG)

MA 13.12: Poster

Dienstag, 1. April 2014, 15:01–15:45, HSZ 04

Brillouin light scattering investigations of perpendicular standing spin waves at Au and Ag nanoparticles on top of a Ni₈₁Fe₁₉ film — •Thomas Meyer, Björn Obry, and Burkard Hillebrands — FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

In the last decades various optical characterization methods like Raman spectroscopy made use of the excitation of plasmons in metallic nanoparticles. Due to a local field enhancement provided by localized plasmons the signal strength as well as the spatial resolution can be significantly increased. This effect is often referred to as surface enhancement like in the case of surface enhanced Raman spectroscopy. We present Brillouin light scattering (BLS) studies of perpendicular standing spin waves in a thin Ni₈₁Fe₁₉ film with single gold and silver nanoparticles on top. At the position of the nanoparticles an increase of the BLS signal as well as a frequency shift of the spin waves is observed. Besides their plasmonic properties other influences of the nanoparticles on the magnetization dynamics have to be taken into account. In order to identify the different contributions to the observed signal changes, investigations using different materials, sizes and shapes of the structures have been performed.