Magneto-optical properties of CrO2.

The magneto-optical, polar Kerr effect of polycrystalline CrO 2 has been studied in the range 0.8-5 eV. The maximum Kerr rotation amounts to |θ K |=0.154 o at 3.7 eV. Two different interpretations of the observed magneto-optical transitions are discussed: (1) based on published spin-polarized band structure calculations and (2) based on published spin-polarized photoemission data. Additional transport measurements are made to elucidate the free-electron contributions