非晶質希土類遷移金属薄膜の短波長域でのカー楕円率と光学応答

抄録

Kerr ellipticity angle γ_k of TbFeCo film and its influence on the rnagneto-optical responses of magneto-optical media were investigated. The γ_k was derived through wavelength range of 400∼830 nm by a simple method which adjusts the calculated value of Kerr rotation angle to match with the measured one by varying γ_k. Kerr ellipticity angle γ_k of the TbFeCo film increased with shortening of the wavelength, although Kerr rotation angle θ_k decreased. Contribution of θ_k and that of γ_k to the Kerr rotation angle of the films with enhancing structure could be separated and were found to be additive and the latter one was more dominant at the shorter wavelength. It was also shown that the maximum value of the figure of merit of 4-layer medium is enhanced by the contribution from the γ_k.