We report strong amplification of the photomagnetic spin precession in Co-doped YIG employing a surface plasmon excitation metal-dielectric magneto-plasmonic crystal. Plasmonic enhancement is accompanied by localization within 300 nm thick layer inside transparent dielectric garnet. Experimental results are nicely reproduced numerical simulations excitation. Our findings demonstrate concept sub...

We analyze, both experimentally and numerically, the nonlinear regime of photo-induced coherent magnetization dynamics in cobalt-doped yttrium iron garnet films. Photo-magnetic excitation with femtosecond laser pulses reveals a strongly response spin subsystem significant increase effective Gilbert damping. By varying fluence external magnetic field, we show that this nonlinearity originates an...