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Surfaces and interfaces of magnetic nanostructures can reveal ratherinteresting and unusual properties that differ substantially from those ofbulky materials. Here we apply the surface-sensitive method of optical secondharmonic generation (SHG) for the studies of magnetization induced effects thatappear in the nonlinear reflection from interfaces between ferromagnetic (Co)and heavy metals (Pt, Ta, W, Au, Ag, Cu). We demonstrate the appearance ofmagnetization induced variation in the p-polarized SHG intensity in thegeometry of the longitudinal magneto-optical Kerr effect that is forbidden forhomogeneous magnetic structures. This confirms the existence of chiral magneticstates at heavy metal/ferromagnet interfaces that appear due to thesurface-induced Dzyaloshinskii-Moriya interaction. The related nonlinearchiroptical effect in the SHG intensity is proportional to the dcflexo-electric polarization that is shown to exist for chiral magnetic statesat the considered interfaces.

Optical second harmonic generation from interfaces between heavy and ferromagnetic metals