We have investigated the Faraday spectra of ferromagnetic rutile Ti 1-xCoxO2-δ films grown on Al 2O3 (0001). The Faraday spectra strongly depended on the film thickness, revealing the significant effect of the multiple reflections of light. The intrinsic Faraday spectra of rutile Ti1-xCo xO2-δ were corrected for this multiple reflection effect on the basis of an optical model and compared with the absorption spectra in detail. The quantitatively good correspondence between intrinsic Faraday ellipticity and optical band edge strongly suggests that rutile Ti 1-xCoxO2-δ is an intrinsic ferromagnetic semiconductor. The exchange parameters, N0α and N 0β, were estimated as the order of ∼0.1 eV.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)