Magneto-Optical Kerr Effect of Compositionally Modulated Co/Pt Films

In this paper the magneto-optical polar Kerr rotation spectra of compositionally modulated films (CMF) Co/Pt are calculated by using Fresnel's equations. For CMF Co/Pt with d_Co/d_pt=1/2, 1 and 2 the magneto-optical Kerr rotation at any wavelength increases with the increasing modulation wavelength in the wavelength region from 200 to 800nm. For CMF Co/Pt of constant d_pt the Kerr rotation increases with d_co increasing while of constant d_co the Kerr rotation increases with d_pt decreasing. From numerical calculations it is suggested that for CMF Co/Pt with small d_pt the Pt sublayer is polarized and has a positive contribution to the Kerr rotation of CMF Co/Pt.