Cavity enhancement of the magneto-optic Kerr effect in glass/Al/SnO2/PtMnSb/SnO2 structure

The cavity enhancement effect of the transparent semiconductor SnO2 on the magneto-optical Kerr response of the glass/Al/SnO2/PtMnSb/SnO2 multilayer structure has been investigated using a matrix method. It has been demonstrated that device optimization leads to large Kerr rotation and figure of merit (FOM) with a vanishing ellipticity in the visible portion of the electromagnetic spectrum, especially at short wavelengths. This optimization is of interest in view of optical data storage technology. Using numerical simulations, we have also shown that in the optimum condition, the device readout parameters behave smoothly against the design variables.