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| Influence of Bath Composition on Magnetic Properties of Electrodeposited Co��Pt��W Thin Films |
| GE Hong��liang,WEI Guo��ying,WU Qiong,ZHOU Qiao��ying,WANG Xin��yan |
| College of Material Science and Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China |
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Abstract Effect of bath composition ([Co2+]/[Pt��] and [WO2-4], [cit-]) and pH on the magnetic properties of electrodeposited Co��Pt��W thin films has been investigated. Electrodeposited Co��Pt��W thin films exhibited strong perpendicular magnetic anisotropy when the ratio of [Co2+] to [Pt��] was 10; cathode current efficiency and perpendicular magnetic anisotropy showed little variations when [WO2-4] was lower than 0��1 mol/L, but perpendicular magnetic anisotropy had strengthened when [WO2-4] was over 0��1 mol/L, which could be explained by the fact that the hydrogen evolution could produce pores as magnetic domain pinnings; citrate as complexing reagent can promote the polarization of [Co2+] and [Pt��]. As a result, the equilibrium electrode potentials of cobalt and platinum moved to negative direction, which led to the co��deposition of Co, Pt, and W. It was also found out that the as��deposited Co��Pt��W hard magnetic thin films were very homogeneous, smooth, and had the maximum coercivity for the bath pH 8��5 and the concentration of citrate 0��26 mol/L.
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Received: 01 January 1900
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2007, Vol. 14 
