After annealing at 300???C the FRA attained a maximum of 1.1???104deg/cm (an increase of 38%), but thereafter declined monotonically as TA was increased to 650???C. The ellipticity shows a similar behavior with TA. However, the corresponding variation in saturation magnetization (Ms) with TA does not match that of the magneto-optical constants, which suggests that factors other than Ms also determ