Abstract
The Co33Fe65 magnetic thin films with Cu underlayer were prepared and characterized using RF magnetron sputtering. Nano under layer effects on the magnetic properties and crystalline structure of the film were investigated for the GHz frequency use. It was found that the underlayer was very effective in inducing elongation of lattice parameter, preferred crystalline orientation, and decrease of crystallite size. These effects were attributable to a reduction of surface energy in the underlayer and led to improve remarkably the magnetic properties for the GHz frequency use above 10 GHz.
