5) Figures 3 (a) and (b): It could be good to use the same horizontal scale for a clearer comparison.
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?