OPTICAL REFLECTION AND POLAR KERR ROTATION OF COBALT AND TITANIUM SUBSTITUTED BARIUM HEXAFERRITES

Optical reflection and the polar Kerr rotation of four single crystals of barium hexagonal ferrites were measured in the visible and near infrared region at room temperature. Local extrema of the polar Kerr rotation at wavelengths of 1650, 1350 and 760 nm could be assigned to the presence of Co2+ in tetrahedral positions. The figure of merit attains the maximum values at these wavelengths suggesting material to be suitable for the magneto-optical storage applications.