Surface roughness analysis and magnetic property studies of nickel thin films electrodeposited onto rotating disc electrodes
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Ni films were electrodeposited onto polycrystalline gold substrates mounted on a rotating disc electrode. The effects of rotation speed, film thickness and current density on the kinetic roughening and magnetic properties of the films were investigated. The film surface roughness was imaged using an atomic force microscope (AFM). The results indicate that the film roughness increases as the film thickness or deposition current density increases. We found that the electrodeposited Ni films exhibit anomalous scaling since both local and large-scale roughnesses show a power-law dependence on the film thickness. The effect of electrode rotation speed on the film surface roughness was also investigated. Scanning electron microscopy studies (SEM) had a good agreement with the AFM results. The average crystalline size of the film surfaces is also calculated from X-ray line broadening using (220) peak and Debye–Scherrer formula. The obtained results agree with that of AFM and SEM. The Ni thin films which are grown at different deposition current densities and rotation speeds exhibit in-plane magnetization with coercivities less than 110 Oe.
KeywordsRotation Speed Rotate Disc Electrode Average Crystalline Size Rotation Speed Increase Roughness Exponent
Some AFM images have been taken in the AFM Lab, Department of Physics, University of Bristol, UK. Authors would like to thank Professor Walther Schwarzacher for his collaboration. Especial thanks to N. Nabiyouni for English assistance.
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