Thickness and temperature dependence of the magnetodynamic damping of pulsed laser deposited La_(0.7)Sr_(0.3)MnO₃ on (111)-oriented SrTiO₃

We have investigated the magnetodynamic properties of $\text{La}_{0.7}\text{Sr}_{0.3}\text{MnO}_3$ (LSMO) films of thickness 10, 15 and 30 nm grown on (111)-oriented SrTi$\text{O}_3$ (STO) substrates by pulsed laser deposition. Ferromagnetic resonance (FMR) experiments were performed in the temperature range 100--300 K, and the magnetodynamic damping parameter $\alpha$ was extracted as a function of both film thickness and temperature. We found that the damping is lowest for the intermediate film thickness of 15 nm with $\alpha \approx 2 \cdot 10^{-3}$, where $\alpha$ is relatively constant as a function of temperature well below the Curie temperature of the respective films.