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We present a comprehensive investigation of propagating spin waves innanometer-thick yttrium iron garnet (YIG) films. We use broadband spin-wavespectroscopy with integrated coplanar waveguides (CPWs) and microstrip antennason top of continuous and patterned YIG films to characterize spin waves withwave vectors up to 10 rad/$\mu$m. All films are grown by pulsed laserdeposition. From spin-wave transmission spectra, parameters such as the Gilbertdamping constant, spin-wave dispersion relation, group velocity, relaxationtime, and decay length are derived and their dependence on magnetic bias fieldstrength and angle is systematically gauged. For a 40-nm-thick YIG film, weobtain a damping constant of $3.5 \times 10^{-4}$ and a maximum decay length of1.2 mm. Our experiments reveal a strong variation of spin-wave parameters withmagnetic bias field and wave vector. Spin-wave properties change considerablyup to a magnetic bias field of about 30 mT and above a field angle of$\theta_{H} = 20^{\circ}$, where $\theta_{H} = 0^{\circ}$ corresponds to theDamon-Eshbach configuration.

Propagating spin waves in nanometer-thick yttrium iron garnet films: Dependence on wave vector, magnetic field strength and angle