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- W3108907507 abstract "Li/Ag/Cu doping and Zn vacancies have been theoretically and experimentally shown to induce ZnO to have room-temperature ferromagnetism. However, the source and mechanism of magnetic properties of such doped systems remain unclear. Previous researchers believe that all oxygen ions are negative divalent ions, as the basic assumption of the double-exchange interaction model, but no reasonable theoretical explanation has been put forward. Experimental control of Zn vacancies in ZnO is also challenging, but first principles can solve such problems. In this work, based on the generalized gradient approximation plane wave ultrasoft pseudopotential + U method under the framework of spin density functional theory, we used first principles to study the effect of the magnetic source and mechanism of Li/Ag/Cu doping and Zn vacancy on ZnO. We found that in addition to O2– ions, some O1– ions also existed in all doping systems. These ions had the dual-nature universality of itinerant electrons (donors) and local electrons (acceptors). The itinerant electrons in the Zn14LiO16, Zn14AgO16, and Zn14CuO16 systems further possessed the same spin. Compared with Zn14LiO16, Zn14AgO16, and Zn14CuO16 systems under the same doping amount, our results showed that the magnetic properties of Zn28Li2O32, Zn28Ag2O32, and Zn28Cu2O32 systems all increased. The Zn28Li2O32 system was found to be highly advantageous as a ferromagnetic functional material, which can guide the study of the magnetic source and mechanism of ZnO and similar oxide semiconductors through itinerant electrons." @default.
- W3108907507 created "2020-12-07" @default.
- W3108907507 creator A5028204191 @default.
- W3108907507 creator A5038706338 @default.
- W3108907507 date "2021-03-01" @default.
- W3108907507 modified "2023-10-18" @default.
- W3108907507 title "First-principles study of acceptor Li/Ag/Cu doping and Zn vacancy on the magnetic mechanism of ZnO and the universality of itinerant electrons" @default.
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- W3108907507 doi "https://doi.org/10.1016/j.mtcomm.2020.101944" @default.
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