ENHANCEMENT OF THE MAGNETOOPTICAL KERR ANGLE IN NONLINEAR-OPTICAL RESPONSE

Using an electronic theory we present calculations of the magneto-opti cal Kerr rotation angle in second-harmonic generation (SHG). For the l ongitudinal and polar Kerr configuration and for arbitrary angles of i ncidence it is found that the Kerr angle in SHG may be enhanced by up to one order of magnitude compared to the linear Kerr angle. This enha ncement is caused by interband and intraband transitions (plasmons), w hich in the linear case suppress the Kerr rotation in the optical rang e. Our results will be useful for a microscopic study of two-dimension al magnetism.