Spin waves in micro-structured yttrium iron garnet nanometer-thick films
  We investigated the spin-wave propagation in a micro-structured yttrium iron garnet waveguide of $40$ nm thickness. Utilizing spatially-resolved Brillouin light scattering microscopy, an exponential decay of the spin-wave amplitude of $(10.06 \pm 0.83)$ $\mu$m was observed. This leads to an estimated Gilbert damping constant of $\alpha=(8.79\pm 0.73)\times 10^{-4}$, which is larger than damping values obtained through ferromagnetic resonance measurements in unstructured films. The theoretically calculated spatial interference of waveguide modes was compared to the spin-wave pattern observed experimentally by means of Brillouin light scattering spectroscopy. 
Matthias B. Jungfleisch, Wei Zhang, Wanjun Jiang, Houchen Chang,   Joseph Sklenar, Stephen M. Wu, John E. Pearson, Anand Bha...
cond-mat.mes-hall cond-mat.mtrl-sci