SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.74: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Excitation of propagating spin waves in Ga:YIG thin films — •Moritz Bechberger1, David Breitbach1, Björn Heinz1, Bert Lägel1, Carsten Dubs2, Burkard Hillebrands1, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, Germany — 2INNOVENT e.V. Technologieentwicklung, Jena, Germany
The material parameters of yttrium-iron-garnet (YIG), a well-known material in the research field of magnonics, can be modified by a partial substitution with gallium atoms leading to a lower saturation magnetization. In this study the propagation properties of spin waves in a YIG thin film doped with gallium (Ga:YIG) were investigated and characterized. Direct excitation of coherent spin waves was performed by patterned microantennas and they were detected using TR-BLS microscopy. Our experiments confirm the presence of fast, exchange dominated spin waves, as well as an isotropic spin-wave dispersion relation. In addition, the influence of nonlinear effects on the spin wave excitation was determined. In agreement with the negative effective magnetization of the Ga:YIG film, using high amplitude excitation, we find a positive nonlinear frequency shift for an in-plane magnetization. This results in a significant power-dependent foldover effect, which provides nonlinear power dependencies for the excitation. This study is of high interest for magnonic data processing and reveals novel possibilities for magnonic devices with a tunable nonlinearity. This research is funded by the DFG - Project No. 271741898 and TRR 173-268565370 (B01) and the ERC Grant No. 101042439 'CoSpiN'.