  In this Letter we study the generation of quasi-static magnetic fields by the
plasmon-induced inverse Faraday effect and propose a magneto-optical waveguide
structure for achieving magnetization switching at sub-ps time in a
nano-confined magneto-optical structure. In particular we show that the
direction of the generated quasi-static field in a magneto-optical dielectric
cavity side-coupled to a metal-insulator-metal (MIM) waveguide depends
sensitively on the wavelength of the surface plasmon polaritions (SPP). This
phenomenon could open up a new energy-efficient ultrafast method for
nano-confined all-optical magnetization switching by two-frequency pulses.
