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We report strong amplification of photo-magnetic spin precession in Co-dopedYIG employing a surface plasmon excitation in a metal-dielectricmagneto-plasmonic crystal. Plasmonic enhancement is accompanied by thelocalization of the excitation within the 300~nm-thick layer inside thetransparent dielectric garnet. Experimental results are nicely reproduced bynumerical simulations of the photo-magnetic excitation. Our findingsdemonstrate the magneto-plasmonic concept of subwavelength localization andamplification of the photo-magnetic excitation in dielectric YIG:Co and open upa path to all-optical magnetization switching below diffraction limit withenergy efficiency approaching the fundamental limit for magnetic memories.

Surface plasmon-enhanced photo-magnetic excitation of spin dynamics in Au/YIG:Co magneto-plasmonic crystals