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Effect of bath composition([Co2+]/[PtⅣ] 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 [PtⅣ] 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 [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.
Effect of bath composition ([Co2 +] / [PtIV] 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 showing strong perpendicular magnetic anisotropy when the ratio of [Co2 +] to [PtIV] was 10; cathode current efficiency and perpendicular magnetic anisotropy showed little variations when [WO2-4] was lower than 0.1 mol / L, but 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 [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 an d the concentration of citrate 0.26 mol / L.