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Influence of Bath Composition on Magnetic Properties of Electrodeposited Co-Pt-W Thin Films

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Abstract

Effect of bath composition ([Co2+]/[PtIV] and [WO42, [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 [PtIV] was 10; cathode current efficiency and perpendicular magnetic anisotropy showed little variations when [WO42] was lower than 0. 1 mol/L, but perpendicular magnetic anisotropy had strengthened when [WO42−] 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 [PtIV]. 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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Authors and Affiliations

  1. College of Material Science and Engineering, China Jiliang University, Hangzhou, Zhejiang, 310018, China

    Hong-liang Ge (Doctor, Professor), Guo-ying Wei, Qiong Wu, Qiao-ying Zhou & Xin-yan Wang

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  1. Hong-liang Ge
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  2. Guo-ying Wei
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  3. Qiong Wu
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  4. Qiao-ying Zhou
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  5. Xin-yan Wang
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Correspondence to Hong-liang Ge.

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Foundation Item: Item Sponsored by National Natural Science Foundation of China (20571067)

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Ge, Hl., Wei, Gy., Wu, Q. et al. Influence of Bath Composition on Magnetic Properties of Electrodeposited Co-Pt-W Thin Films. J. Iron Steel Res. Int. 14, 65–68 (2007). https://doi.org/10.1016/S1006-706X(07)60060-0

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  • DOI: https://doi.org/10.1016/S1006-706X(07)60060-0

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