Thanks for the commerts. The saturation magnetization of rare-earth doped YIG affects the Faraday rotation angle. Sayetat et al. and Ostorero et al. previously reported that the compensation temperature of DyIG is Tcomp = 225 K [1,2], which could decrease the Faraday rotation angle of Dy:CeIG in this work at the temperature below 300 K. Therefore, a higher Faraday rotation may be related to the increase of the saturation magnetization of this material in this temperature range. Revisions: Page 5, line 170-173, added “The increase of the Faraday rotation below 40 ℃ is possibly due to the increase of the magnetization of this material at this temperature range, considering a compensation temperature of 225 K in Dy3Fe5O12 [19,20].”.
Figures 2 (c) and (d). While the Faraday rotation angle appears to decrease more or less linearly with temperature in the Ce:YIG film (as far as can be inferred from the non-linear horizontal scale), the decrease is not taking place at the same rate in the Dy:Ce:YIG film. What causes this different behavior?