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- W2790440147 abstract "In order to distinguish the contribution of various chemical states in the Co-doped ZnO film on the ferromagnetism, the films were prepared by oxidizing as-deposited Co-Zn films fabricated by molecular beam vapor deposition method. Different growth modes of multilayer, co-deposition, and bilayer of the Co-Zn films and oxidization temperature of 300 or 600 °C were used to control the cobalt states of Co metal, cobalt oxide, Co ion in the ZnO lattice and the defects of oxygen vacancy in the films. The insufficient oxidization at 300 °C leads to the aggregation of Co metal. The Co metal features ferromagnetism in the films of the three growth modes. After the films oxidized at 600 °C, the Co ions are predominant in the co-deposition film. The oxygen vacancies are predominant for the bilayer film. Meanwhile, a small amount of cobalt oxide is formed in the co-deposition films. However, no ferromagnetism is observed at room temperature for all the films oxidized at 600 °C. This means that the cobalt oxide, Co ion, and oxygen vacancy cannot improve the RT ferromagnetism. When the measurement temperature decreases to − 150 °C, the ferromagnetism appears in the bilayer film due to the oxygen vacancy. The weak magnetism presents in the co-deposition film because of the Co ions indicating that the oxygen vacancy is more significant in obtaining ferromagnetism than the Co ions." @default.
- W2790440147 created "2018-03-29" @default.
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- W2790440147 date "2018-04-01" @default.
- W2790440147 modified "2023-10-14" @default.
- W2790440147 title "Control of chemical states on magnetic properties of Co-doped ZnO films prepared by oxidizing evaporated Co-Zn film with different growth modes" @default.
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- W2790440147 doi "https://doi.org/10.1016/j.ceramint.2018.01.162" @default.
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