Abstract
A large magneto-optical effect near the wavelength of 0.7 μm and 1.5 μm in the ferrites containing tetrahedral Co2+ ions is studied on the basis of the crystal field theory, and the present calculated spectrum essentially reproduces the experimentally observed Faraday rotation curves of the Co2+ ion substituted ferrites. Eigenstates corresponding to the 0.7 μm and 1.5 μm transitions are determined in the framework of the strong crystal field approximation using data of the absorption spectra of the tetrahedral Co2+ ions in the garnets. The strengths of these transitions and the spin-orbit interaction coefficients of the excited states are calculated from the eigenstates. With these parameters, Faraday rotation spectrum is calculated in the wavelength range of 0.5 μm -2.0 μm.
