INFLUENCE OF MAGNETISM ON 2ND-HARMONIC GENERATION

Optical second harmonic generation (SHG) in 75-degrees reflection was studied on longitudinally magnetized PtMnSb(111) and magnetic circular dichroism was observed with SHG. For circularly polarized incident li ght of 532 nm it amounts to (7 +/- 1)%. For linearly polarized inciden t radiation this leads to a nonlinear magneto-optical Kerr rotation of (14 +/- 2)degrees. The strong symmetry-breaking effect of the magneti zation is demonstrated by a 90-degrees turn of the SH polarization ell ipse with regard to the linear polarization of the fundamental light.