M. A. W. Schoen, J. M. Shaw, H. T. Nembach, M. Weiler, and T. J. Silva: Radiative damping in waveguide-based ferromagnetic resonance measured via analysis of perpendicular standing spin waves in sputtered permalloy films. 2015Phys. Rev. B: 92. http://link.aps.org/doi/10.1103/PhysRevB.92.184417