Abstract
Magnetic properties in Zn-doped SnO2 are examined through the first-principles electronic structure calculations based on density functional theory. Our results reveal that Zn-doping induces localized spin magnetic moments primarily on the first coordination shell of O atoms surrounding the Zn atom as well on Zn atom with total magnetic moment of 1.47 μB per supercell. Holes localized on O atoms in ZnO6 are polarized with the same spin orientation as that of the dopant. Ferromagnetic coupling between Zn ions in Zn-doped SnO2 is attributed to the hole-mediated p-d exchange coupling interaction. With respect to native defects in Zinc-doped SnO2, formation of oxygen vacancy (VO) is suppressed whereas formation of tin vacancy (VSn) is facilitated due to Zn-doping. It is found that the observed ferromagnetism in Zn-doped SnO2 mainly originates from the Zn dopant rather than exclusively the formation of VSn.
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