GdTbFeCo magnetic thin films were prepared onto glass substrates by RF magnetron sputtering system. The effect of sputtering parameters on the magneto-optical properties of thin films were investigated. It is found that when the distance between the target and substrates, the sputtering power, sputtering pressure and thickness of the GdTbFeCo thin films are 72 mm, 75 W, 0.5 Pa and 120 nm, respectively, the Kerr rotation angle and coercivity that in the per...