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MA: Fachverband Magnetismus

MA 45: Magnonics I

MA 45.13: Vortrag

Donnerstag, 19. März 2020, 12:45–13:00, HSZ 401

Spin wave excitation by surface acoustic waves — •Moritz Geilen¹, Felix Kohl¹, Alexandra Nicoloiu², Florin Ciubotaru³, Christoph Adelmann³, Alexandru Müller², Burkard Hillebrands¹, and Philipp Pirro¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Germany — ²IMT, Bucharest, Romania — ³IMEC, Leuven, Belgium

Surface acoustic waves (SAW) are strain waves which are located close to the surface of a medium. They are widely used in bandfilters up to the GHz regime because of their tuneability and narrow bandwidth given by wavevector selection during excitation and detection. Is a magnetic film placed on the surface of the medium an effective field is generated by the magnetoelastic interaction. This field can be used to excite spin waves. We present the investigation on spin wave excitation in a CoFeB microstripe on top of a GaN layer. Both, the SAWs and the spin waves, have been measured by Brillouin light scattering microscopy. With this technique spatially resolved measurements are possible while the signals caused by phonons and magnons can be well separated by the polarization of the scattered light. We found that spin waves can be excited in a wide wavevector regime. We acknowledge the support of the EU under H2020 FET Open Project CHIRON (grant agreement no 692519 2018 - 2021).