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Ultrafast all-optical control of spins with femtosecond laser pulses is oneof the hot topics at the crossroads of photonics and magnetism with a directimpact on future magnetic recording. Unveiling light-assisted recordingmechanisms for an increase of the bit density beyond the diffraction limitwithout excessive heating of the recording medium is an open challenge. Here weshow that surface plasmon-polaritons in hybrid metal-dielectric structures canprovide spatial confinement of the inverse Faraday effect, mediating theexcitation of localized coherent spin precession with 0.41 THz frequency. Wedemonstrate a two orders of magnitude enhancement of the excitation efficiencyat the surface plasmon resonance within the 100 nm layer in dielectric garnet.Our findings broaden the horizons of ultrafast spin-plasmonics and openpathways towards non-thermal opto-magnetic recording at the nano-scale.

Surface plasmon-mediated nanoscale localization of laser-driven sub-THz spin dynamics in magnetic dielectrics