Characterization of Interfaces in (Fe(xML)/Au(xML)) Superlattices by Means of the Nonlinear Magneto-optical Effect

摘要

The magnetic second-harmonic generation(MSHG), one of nonlinear magneto-optical effects, wasmeasured by using a Ti-sapphire laser (#lambda#=810 nm)combined with filters, a polarizer; an analyzer; a detector and aphoton-counting apparatus. The polar plot of the azimuthaldependence of the MSHG from a (Fe(3.7SML)/Au(3.75ML))superlattice showed a four fold symmetry pattern. A reversal ofthe magnetic field caused reflection of the azimuthal patternswith respect to a certain axis. Nonlinear magneto-optical Kerrrotation as large as 31.1 deg was observed in(Fe(1.75ML)/Au(1.75ML)) for the S-polarization incidence. Themagnetic contribution to the azimuthal pattern was explained bysymmetry analysis, taking into account the surface non-magnetic (electric dipole), bulk non-magnetic (electricquadrupole) and surface magnetic (electric dipole) contributions.