Effect of bath composition （[Co^2＋]/[-Pt^Ⅳ ] and [-WO4^2- ], [cit^-]） and pH on the magnetic properties of electrodeposited Co-Pt-W thin films has been investigated. Electrodeposited Co-Pt-W thin films exhibited s...Effect of bath composition （[Co^2＋]/[-Pt^Ⅳ ] and [-WO4^2- ], [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 [-Co^2＋ ] to [-Pt^Ⅳ ] was 10 ; cathode current efficiency and perpendicular magnetic anisotropy showed little variations when [WO4^2- ] was lower than 0. 1 mol/L, but perpendicular magnetic anisotropy had strengthened when [WO4^2-] 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 [Co^2＋] and [Pt^Ⅳ]. 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.展开更多
Nano-ZiO_2was used to prepare composite electroplating bath by addingdifferent kinds of dispersants such as PEG and MZS. The composite electroplating bath was studied bymeans of sedimentation experiments and particle-...Nano-ZiO_2was used to prepare composite electroplating bath by addingdifferent kinds of dispersants such as PEG and MZS. The composite electroplating bath was studied bymeans of sedimentation experiments and particle-size analysis. The results showed that dispersantswith simple structure and small molecular weight could not play steric role, however, the highlydispersed and stabilized nanoparticle Ni-ZrO_2 composite electroplating bath was obtained at pHvalue equaling to 3 by adding MZS which is a kind of macromolecule dispersant with plentifulbranched chains.展开更多
基金Item Sponsored by National Natural Science Foundation of China(20571067)
文摘Effect of bath composition （[Co^2＋]/[-Pt^Ⅳ ] and [-WO4^2- ], [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 [-Co^2＋ ] to [-Pt^Ⅳ ] was 10 ; cathode current efficiency and perpendicular magnetic anisotropy showed little variations when [WO4^2- ] was lower than 0. 1 mol/L, but perpendicular magnetic anisotropy had strengthened when [WO4^2-] 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 [Co^2＋] and [Pt^Ⅳ]. 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.
文摘Nano-ZiO_2was used to prepare composite electroplating bath by addingdifferent kinds of dispersants such as PEG and MZS. The composite electroplating bath was studied bymeans of sedimentation experiments and particle-size analysis. The results showed that dispersantswith simple structure and small molecular weight could not play steric role, however, the highlydispersed and stabilized nanoparticle Ni-ZrO_2 composite electroplating bath was obtained at pHvalue equaling to 3 by adding MZS which is a kind of macromolecule dispersant with plentifulbranched chains.
