Abstract
The microstructure, magnetic properties and microwave characteristics of NiFe films were investigated with chemical composition variation. It was found that Ni concentration has a strong influence on film stress and film surface roughness which induces variations in static and dynamic anisotropy field. Also, with the variation of Ni concentration, there is a spin-reorientation behavior which may be attributed to the contribution of the magnetic anisotropy originating from the composition gradient and the anisotropy induced by deposition field. Ferromagnetic resonance and rotatable magnetic anisotropy were observed for NixFe1−x (x=0.51–0.76) films. The results were discussed based on Landau–Lifshitz–Gilbert equation and magnetic ripple theory. The rotatable anisotropy field was highly correlated to the film surface roughness. The ferromagnetic resonance varied from 0.589 to 0.886GHz as Ni concentration was increased from 0.51 to 0.76wt. ratio.
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