Browsing by Author "Wu, Kuei-Ching"

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Room-temperature ferromagnetism in carbon- and nitrogen-doped rutile TiO2
(2015-02-01)
Wang, Jia-Bin
;
Wu, Kuei-Ching
;
Mi, Jyun-Wei
;
Luo, Chih-Wei
;
Wu, Kaung-Hsiung
Marked room-temperature ferromagnetism (RTFM) was obtained in carbon- and nitrogen-doped rutile powders. X-ray photoelectron spectroscopy measurements revealed the co-existence of considerable densities of states near the Fermi level () and oxygen vacancies primarily induced by C- and N-doping. Density functional theory calculations showed that the local moments responsible for the observed RTFM in N-doped were primarily attributed to the partially populated, spin-polarized Ti band. In addition to the unfilled Ti band, the spin splitting in C states near in C-doped , which may be induced by the interaction between the C impurities and neighboring oxygen ions, results in Stoner band-splitting-type ferromagnetism.